diff --git a/src/components/dialogs/import-modification-dialog.tsx b/src/components/dialogs/import-composite/import-modification-dialog.tsx
similarity index 80%
rename from src/components/dialogs/import-modification-dialog.tsx
rename to src/components/dialogs/import-composite/import-modification-dialog.tsx
index 74f3caa0d2..fa40635dae 100644
--- a/src/components/dialogs/import-modification-dialog.tsx
+++ b/src/components/dialogs/import-composite/import-modification-dialog.tsx
@@ -7,6 +7,7 @@
 
 import { FormattedMessage, useIntl } from 'react-intl';
 import {
+    CheckboxInput,
     CustomFormProvider,
     DirectoryItemSelector,
     DndColumn,
@@ -17,15 +18,14 @@ import {
     TreeViewFinderNodeProps,
     useSnackMessage,
 } from '@gridsuite/commons-ui';
-import { insertCompositeModifications, type ModificationPair } from '../../services/study';
+import { type CompositesToBeInserted, insertCompositeModifications } from '../../../services/study';
 import { JSX, useCallback, useEffect, useMemo, useState } from 'react';
 import { useSelector } from 'react-redux';
-import { AppState } from 'redux/reducer.type';
-import { CompositeModificationAction } from 'components/graph/menus/network-modifications/network-modification-menu.type';
+import { AppState } from '../../../redux/reducer.type';
+import { CompositeModificationAction } from '../../graph/menus/network-modifications/network-modification-menu.type';
 import {
     Box,
     Button,
-    Checkbox,
     Dialog,
     DialogActions,
     DialogContent,
@@ -33,29 +33,19 @@ import {
     Divider,
     FormControl,
     FormControlLabel,
-    FormHelperText,
     Radio,
     RadioGroup,
     Step,
     StepLabel,
     Stepper,
-    TextField,
     Typography,
 } from '@mui/material';
-
-import {
-    Controller,
-    useController,
-    useFieldArray,
-    useForm,
-    UseFieldArrayReturn,
-    useFormContext,
-    useWatch,
-} from 'react-hook-form';
+import { useController, useFieldArray, UseFieldArrayReturn, useForm } from 'react-hook-form';
 import { yupResolver } from '@hookform/resolvers/yup';
-import { ACTION, SELECTED_MODIFICATIONS } from 'components/utils/field-constants';
+import { ACTION, IS_SHARED, SELECTED_MODIFICATIONS } from '../../utils/field-constants';
 import * as yup from 'yup';
 import { UUID } from 'node:crypto';
+import InsertNameCell from './insert-name-cell';
 
 /**
  * Dialog to select composite network modifications and append them to the current node.
@@ -95,44 +85,8 @@ interface SharedCellProps {
 }
 
 function SharedCell({ rowIndex }: Readonly<SharedCellProps>) {
-    const isShared: boolean = useWatch({
-        name: `${SELECTED_MODIFICATIONS}.${rowIndex}.isShared`,
-    });
-
-    return (
-        <FormControlLabel
-            control={<Checkbox size="small" disabled checked={isShared} sx={{ p: 0, ml: 1 }} />}
-            label={
-                <Typography variant="body2" color="text.disabled" sx={{ ml: 0.5 }}>
-                    <FormattedMessage id="importComposites.shared" />
-                </Typography>
-            }
-            sx={{ mr: 0, alignItems: 'center' }}
-        />
-    );
-}
-
-interface InsertNameCellProps {
-    rowIndex: number;
-}
-
-function InsertNameCell({ rowIndex }: Readonly<InsertNameCellProps>) {
-    const { control } = useFormContext();
-    const originalName: string = useWatch({
-        name: `${SELECTED_MODIFICATIONS}.${rowIndex}.originalName`,
-    });
-
     return (
-        <Box sx={{ display: 'flex', flexDirection: 'column', width: '100%' }}>
-            <Controller
-                name={`${SELECTED_MODIFICATIONS}.${rowIndex}.name`}
-                control={control}
-                render={({ field, fieldState }) => (
-                    <TextField {...field} size="small" fullWidth error={!!fieldState.error} />
-                )}
-            />
-            <FormHelperText sx={{ px: 1, mt: 0.25 }}> {originalName}</FormHelperText>
-        </Box>
+        <CheckboxInput name={`${SELECTED_MODIFICATIONS}.${rowIndex}.${IS_SHARED}`} label={'importComposites.shared'} />
     );
 }
 
@@ -192,8 +146,8 @@ const ImportModificationDialog = ({ open, onClose }: Readonly<ImportModification
 
     const { field: actionField } = useController({ name: ACTION, control });
 
-    const action = watch(ACTION);
-    const selectedModifications = watch(SELECTED_MODIFICATIONS);
+    const action: CompositeModificationAction = watch(ACTION);
+    const selectedModifications: SelectedComposite[] = watch(SELECTED_MODIFICATIONS);
     const isInsertMode = action === CompositeModificationAction.INSERT;
     const isNextDisabled = selectedModifications.length === 0;
 
@@ -207,7 +161,7 @@ const ImportModificationDialog = ({ open, onClose }: Readonly<ImportModification
     const sharedColumn: DndColumn = useMemo(
         () => ({
             label: '',
-            dataKey: 'isShared',
+            dataKey: IS_SHARED,
             initialValue: false,
             editable: true,
             width: '25%',
@@ -217,7 +171,7 @@ const ImportModificationDialog = ({ open, onClose }: Readonly<ImportModification
         []
     );
 
-    // SPLIT mode — name is read-only, drag-and-drop only
+    // SPLIT mode — name is read-only, drag-and-drop only, cannot be shared
     const splitColumnsDefinition: DndColumn[] = useMemo(
         () => [
             {
@@ -228,9 +182,8 @@ const ImportModificationDialog = ({ open, onClose }: Readonly<ImportModification
                 width: '75%',
                 type: DndColumnType.TEXT,
             },
-            sharedColumn,
         ],
-        [sharedColumn]
+        []
     );
 
     // INSERT mode — name is editable with original name shown below
@@ -268,7 +221,7 @@ const ImportModificationDialog = ({ open, onClose }: Readonly<ImportModification
                 id: e.id as UUID,
                 name: e.name,
                 originalName: e.name,
-                isShared: false,
+                [IS_SHARED]: false,
             }));
             setValue(SELECTED_MODIFICATIONS, newRows, {
                 shouldValidate: true,
@@ -278,32 +231,6 @@ const ImportModificationDialog = ({ open, onClose }: Readonly<ImportModification
         [setValue]
     );
 
-    const handleSelectModification = useCallback(
-        (selectedElements: TreeViewFinderNodeProps[]) => {
-            setIsSelectorOpen(false);
-
-            if (!selectedElements.length) {
-                if (selectedModifications.length === 0) {
-                    onClose();
-                }
-                return;
-            }
-
-            const newRows: SelectedComposite[] = selectedElements.map((e) => ({
-                id: e.id as UUID,
-                name: e.name,
-                originalName: e.name,
-                isShared: false, // currently always false, to be computed later when shared modifications are added
-            }));
-
-            setValue(SELECTED_MODIFICATIONS, newRows, {
-                shouldValidate: true,
-                shouldDirty: true,
-            });
-        },
-        [setValue, selectedModifications.length, onClose]
-    );
-
     const handleNext = useCallback(() => {
         if (isNextDisabled) return;
         setActiveStep(STEP_ORGANIZATION);
@@ -324,9 +251,12 @@ const ImportModificationDialog = ({ open, onClose }: Readonly<ImportModification
     const handleSave = useCallback(() => {
         if (!studyUuid || !currentNode || !isValid) return;
 
-        const modificationsToInsert: ModificationPair[] = selectedModifications.map((m) => ({
-            first: m.id,
-            second: action === CompositeModificationAction.SPLIT ? m.originalName : m.name,
+        const modificationsToInsert: CompositesToBeInserted[] = selectedModifications.map((m: SelectedComposite) => ({
+            id: m.id,
+            // only inserted non shared composites may be renamed
+            name: action === CompositeModificationAction.SPLIT || m.isShared ? m.originalName : m.name,
+            // SPLIT modifications are never shared
+            isShared: action === CompositeModificationAction.INSERT ? m.isShared : false,
         }));
 
         insertCompositeModifications(studyUuid, currentNode.id, modificationsToInsert, action).catch((error) =>
@@ -338,11 +268,10 @@ const ImportModificationDialog = ({ open, onClose }: Readonly<ImportModification
 
     return (
         <CustomFormProvider validationSchema={formSchema} {...formMethods}>
-            <Dialog open={open} onClose={handleClose} maxWidth="md" fullWidth PaperProps={{ sx: { p: 1 } }}>
+            <Dialog open={open} onClose={handleClose} maxWidth="md" fullWidth>
                 <DialogTitle>
                     <FormattedMessage id="importComposites.title" />
                 </DialogTitle>
-
                 <DialogContent sx={{ display: 'flex', flexDirection: 'column', height: 490 }}>
                     <Stepper
                         activeStep={activeStep}
@@ -378,7 +307,7 @@ const ImportModificationDialog = ({ open, onClose }: Readonly<ImportModification
                     >
                         <DirectoryItemSelector
                             open={isSelectorOpen}
-                            onClose={handleSelectModification}
+                            onClose={() => setIsSelectorOpen(false)}
                             types={[ElementType.MODIFICATION]}
                             multiSelect
                             inline
diff --git a/src/components/dialogs/import-composite/insert-name-cell.tsx b/src/components/dialogs/import-composite/insert-name-cell.tsx
new file mode 100644
index 0000000000..bf162fbe4e
--- /dev/null
+++ b/src/components/dialogs/import-composite/insert-name-cell.tsx
@@ -0,0 +1,47 @@
+/**
+ * Copyright (c) 2026, RTE (http://www.rte-france.com)
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+import { IS_SHARED, SELECTED_MODIFICATIONS } from '../../utils/field-constants';
+import { Box, FormHelperText, TextField, Typography } from '@mui/material';
+import { Controller, useFormContext, useWatch } from 'react-hook-form';
+import { JSX } from 'react';
+
+interface InsertNameCellProps {
+    rowIndex: number;
+}
+
+const InsertNameCell = ({ rowIndex }: Readonly<InsertNameCellProps>): JSX.Element => {
+    const { control } = useFormContext();
+    const originalName: string = useWatch({
+        name: `${SELECTED_MODIFICATIONS}.${rowIndex}.originalName`,
+    });
+    const isShared: boolean = useWatch({
+        name: `${SELECTED_MODIFICATIONS}.${rowIndex}.${IS_SHARED}`,
+    });
+
+    return (
+        <Box sx={{ display: 'flex', flexDirection: 'column', width: '100%' }}>
+            {isShared ? (
+                <Typography m={1} component="span" variant="body1">
+                    {originalName}
+                </Typography>
+            ) : (
+                <>
+                    <Controller
+                        name={`${SELECTED_MODIFICATIONS}.${rowIndex}.name`}
+                        control={control}
+                        render={({ field, fieldState }) => (
+                            <TextField {...field} size="small" fullWidth error={!!fieldState.error} />
+                        )}
+                    />
+                    <FormHelperText sx={{ px: 1, mt: 0.25 }}> {originalName}</FormHelperText>
+                </>
+            )}
+        </Box>
+    );
+};
+
+export default InsertNameCell;
diff --git a/src/components/graph/menus/network-modifications/network-modification-node-editor.tsx b/src/components/graph/menus/network-modifications/network-modification-node-editor.tsx
index 5491618810..422855951b 100644
--- a/src/components/graph/menus/network-modifications/network-modification-node-editor.tsx
+++ b/src/components/graph/menus/network-modifications/network-modification-node-editor.tsx
@@ -83,16 +83,16 @@ import TwoWindingsTransformerModificationDialog from '../../../dialogs/network-m
 import { useIsAnyNodeBuilding } from '../../../utils/is-any-node-building-hook';
 
 import { FileUpload, RestoreFromTrash } from '@mui/icons-material';
-import ImportModificationDialog from 'components/dialogs/import-modification-dialog';
+import ImportModificationDialog from '../../../dialogs/import-composite/import-modification-dialog';
 import RestoreModificationDialog from 'components/dialogs/restore-modification-dialog';
 import type { UUID } from 'node:crypto';
 import { AppState } from 'redux/reducer.type';
 import { createCompositeModifications, updateCompositeModifications } from '../../../../services/explore';
 import { copyOrMoveModifications } from '../../../../services/study';
 import {
+    assembleModificationsIntoComposite,
     fetchExcludedNetworkModifications,
     fetchNetworkModifications,
-    assembleModificationsIntoComposite,
     stashModifications,
 } from '../../../../services/study/network-modifications';
 import {
@@ -177,6 +177,14 @@ const NetworkModificationNodeEditor = () => {
         []
     );
 
+    // TODO : this is temporary, until copy/paste/save is done for the shared modifications in GRD-4785 :
+    const selectionContainsShared: boolean = useMemo(() => {
+        return selectedNetworkModifications.some(
+            (modification: ComposedModificationMetadata) =>
+                modification.type === ModificationType.MODIFICATION_REFERENCE
+        );
+    }, [selectedNetworkModifications]);
+
     const [isDragging, setIsDragging] = useState(false);
     const [isAssemblyDepthExceeded, setIsAssemblyDepthExceeded] = useState(false);
 
@@ -1314,7 +1322,7 @@ const NetworkModificationNodeEditor = () => {
                         <IconButton
                             onClick={openCreateCompositeModificationDialog}
                             size={'small'}
-                            disabled={disabledCompositeExport}
+                            disabled={disabledCompositeExport || selectionContainsShared}
                         >
                             <SaveIcon />
                         </IconButton>
@@ -1330,7 +1338,8 @@ const NetworkModificationNodeEditor = () => {
                                 isAnyNodeBuilding ||
                                 mapDataLoading ||
                                 !currentNode ||
-                                isRootNode
+                                isRootNode ||
+                                selectionContainsShared
                             }
                         >
                             <ContentCutIcon />
@@ -1346,7 +1355,8 @@ const NetworkModificationNodeEditor = () => {
                                 selectedNetworkModifications.length === 0 ||
                                 isAnyNodeBuilding ||
                                 mapDataLoading ||
-                                isRootNode
+                                isRootNode ||
+                                selectionContainsShared
                             }
                         >
                             <ContentCopyIcon />
@@ -1368,7 +1378,7 @@ const NetworkModificationNodeEditor = () => {
                         <IconButton
                             onClick={doPasteModifications}
                             size={'small'}
-                            disabled={isPasteButtonDisabled || isRootNode}
+                            disabled={isPasteButtonDisabled || isRootNode || selectionContainsShared}
                         >
                             <ContentPasteIcon />
                         </IconButton>
diff --git a/src/components/utils/field-constants.ts b/src/components/utils/field-constants.ts
index 2db1defa2b..40519c8d88 100644
--- a/src/components/utils/field-constants.ts
+++ b/src/components/utils/field-constants.ts
@@ -459,4 +459,4 @@ export const CONNECTION_SIDE = 'connectionSide';
 
 export const ACTION = 'action';
 export const SELECTED_MODIFICATIONS = 'selectedModifications';
-export const COMPOSITE_NAMES = 'compositeNames';
+export const IS_SHARED = 'isShared';
diff --git a/src/services/study/index.ts b/src/services/study/index.ts
index 2d25709d69..87a52949c5 100644
--- a/src/services/study/index.ts
+++ b/src/services/study/index.ts
@@ -286,15 +286,16 @@ export function copyOrMoveModifications(
     });
 }
 
-export interface ModificationPair {
-    first: UUID;
-    second: string;
+export interface CompositesToBeInserted {
+    id: UUID;
+    name: string;
+    isShared: boolean;
 }
 
 export const insertCompositeModifications = (
     studyUuid: string,
     nodeUuid: string,
-    modifications: ModificationPair[],
+    modifications: CompositesToBeInserted[],
     action: CompositeModificationAction
 ): Promise<void> => {
     const urlSearchParams = new URLSearchParams({ action });