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 0f5be0c319..1ea3aa8ab9 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
@@ -6,10 +6,12 @@
  */
 
 import {
+    ArrowsInputIcon,
     ComposedModificationMetadata,
     ElementSaveDialog,
     ElementType,
     EquipmentType,
+    ErrorMessage,
     ExcludedNetworkModifications,
     fetchNetworkModification,
     IElementCreationDialog,
@@ -70,7 +72,12 @@ import NetworkModificationsMenu from 'components/graph/menus/network-modificatio
 import { useCallback, useEffect, useMemo, useRef, useState } from 'react';
 import { FormattedMessage } from 'react-intl';
 import { useDispatch, useSelector } from 'react-redux';
-import { addNotification, removeNotificationByNode, setModificationsInProgress } from '../../../../redux/actions';
+import {
+    addNotification,
+    removeNotificationByNode,
+    setHighlightModification,
+    setModificationsInProgress,
+} from '../../../../redux/actions';
 import TwoWindingsTransformerModificationDialog from '../../../dialogs/network-modifications/two-windings-transformer/modification/two-windings-transformer-modification-dialog';
 import { useIsAnyNodeBuilding } from '../../../utils/is-any-node-building-hook';
 
@@ -84,6 +91,7 @@ import { copyOrMoveModifications } from '../../../../services/study';
 import {
     fetchExcludedNetworkModifications,
     fetchNetworkModifications,
+    mergeModificationsIntoComposite,
     setModificationMetadata,
     stashModifications,
 } from '../../../../services/study/network-modifications';
@@ -182,6 +190,7 @@ const NetworkModificationNodeEditor = () => {
     const [isFetchingModifications, setIsFetchingModifications] = useState(false);
     const [isUpdate, setIsUpdate] = useState(false);
     const buttonAddRef = useRef<HTMLButtonElement>(null);
+    const [modificationUuidsToReset, setModificationUuidsToReset] = useState<UUID[]>([]);
     const highlightedModificationUuid = useSelector((state: AppState) => state.highlightedModificationUuid);
 
     const {
@@ -733,14 +742,10 @@ const NetworkModificationNodeEditor = () => {
                 // Check if during asynchronous request currentNode has already changed
                 // otherwise accept fetch results
                 if (currentNode.id === currentNodeIdRef.current) {
-                    const liveModifications = res.filter(
-                        (networkModification) => networkModification.stashed === false
-                    );
+                    const liveModifications = res.filter((networkModification) => !networkModification.stashed);
                     updateSelectedItems(liveModifications);
                     setModifications(liveModifications);
-                    setModificationsToRestore(
-                        res.filter((networkModification) => networkModification.stashed === true)
-                    );
+                    setModificationsToRestore(res.filter((networkModification) => networkModification.stashed));
                 }
             })
             .catch((error) => {
@@ -961,6 +966,23 @@ const NetworkModificationNodeEditor = () => {
         networkModificationsToCopy,
     ]);
 
+    const doMergeModificationsIntoComposite = useCallback(() => {
+        const selectedModUuids: UUID[] = selectedNetworkModifications.map((item) => item.uuid);
+        setSaveInProgress(true);
+        mergeModificationsIntoComposite(studyUuid, currentNode?.id, selectedModUuids)
+            .then((compositeUuid: UUID) => {
+                dispatch(setHighlightModification(compositeUuid));
+                setModificationUuidsToReset(selectedModUuids);
+                // TODO : la mettre en édition (après GRD-4232)
+            })
+            .catch((error: ErrorMessage) => {
+                snackWithFallback(snackError, error, { headerId: 'MergeIntoCompositeError' });
+            })
+            .finally(() => {
+                setSaveInProgress(false);
+            });
+    }, [currentNode?.id, dispatch, selectedNetworkModifications, snackError, studyUuid]);
+
     const doCreateCompositeModificationsElements = ({
         name,
         description,
@@ -1168,6 +1190,7 @@ const NetworkModificationNodeEditor = () => {
                 pendingState={pendingState}
                 columns={columns}
                 highlightedModificationUuid={highlightedModificationUuid}
+                modificationUuidsToReset={modificationUuidsToReset}
                 studyUuid={studyUuid}
                 currentNodeId={currentNode?.id}
             />
@@ -1252,6 +1275,41 @@ const NetworkModificationNodeEditor = () => {
                         </IconButton>
                     </span>
                 </Tooltip>
+                <Tooltip
+                    title={
+                        isCompositeNestingLimitReached ? (
+                            <FormattedMessage
+                                id={'CompositeNestingLimitReached'}
+                                values={{ limit: MAX_COMPOSITE_NESTING_DEPTH }}
+                            />
+                        ) : (
+                            <FormattedMessage id={'MergeIntoComposite'} />
+                        )
+                    }
+                >
+                    <span>
+                        <Badge
+                            overlap={'circular'}
+                            color="error"
+                            invisible={!isCompositeNestingLimitReached}
+                            badgeContent={'×'}
+                            sx={styles.badgeStyle}
+                        >
+                            <IconButton
+                                onClick={doMergeModificationsIntoComposite}
+                                size={'small'}
+                                disabled={
+                                    selectedNetworkModifications?.length === 0 ||
+                                    saveInProgress ||
+                                    isRootNode ||
+                                    isCompositeNestingLimitReached
+                                }
+                            >
+                                <ArrowsInputIcon />
+                            </IconButton>
+                        </Badge>
+                    </span>
+                </Tooltip>
                 <Tooltip title={<FormattedMessage id={'importFromGridExplore'} />}>
                     <span>
                         <IconButton
diff --git a/src/services/study/network-modifications.ts b/src/services/study/network-modifications.ts
index 6c1f4ca870..fe55793baa 100644
--- a/src/services/study/network-modifications.ts
+++ b/src/services/study/network-modifications.ts
@@ -1990,6 +1990,22 @@ export function moveVoltageLevelFeederBays({
     });
 }
 
+export function mergeModificationsIntoComposite(
+    studyUuid: UUID | null,
+    nodeUuid: UUID | undefined,
+    modificationUuids: UUID[]
+): Promise<UUID> {
+    const url = `${getStudyUrlWithNodeUuid(studyUuid, nodeUuid)}/composite-modification`;
+    return backendFetchJson(url, {
+        method: 'POST',
+        headers: {
+            Accept: 'application/json',
+            'Content-Type': 'application/json',
+        },
+        body: JSON.stringify(modificationUuids),
+    });
+}
+
 export function getNetworkModificationsFromComposite(
     compositeModificationUuids: string[],
     onlyMetadata: boolean = true
diff --git a/src/translations/en.json b/src/translations/en.json
index 99619bfd91..1e99bb877b 100644
--- a/src/translations/en.json
+++ b/src/translations/en.json
@@ -1036,6 +1036,9 @@
     "importAndReplaceFromGridExplore": "Import and replace from GridExplore",
     "SaveToGridexplore": "Save to GridExplore",
     "SaveToGridexploreError": "An error occurred while saving to GridExplore",
+    "MergeIntoComposite": "Create a composite modification",
+    "MergeIntoCompositeError": "An error occurred during the creation of the composite modification",
+    "DefaultCompositeName": "Composite modification",
     "CompositeNestingLimitReached": "Saving to GridExplore is not possible : would exceed nesting limit ({limit})",
     "diagramConfigCreationMsg": "Network area diagram created in {directory}",
     "diagramConfigUpdateMsg": "Network area diagram {item} updated",
diff --git a/src/translations/fr.json b/src/translations/fr.json
index a07fdd1d5b..e474d3bb6e 100644
--- a/src/translations/fr.json
+++ b/src/translations/fr.json
@@ -1035,6 +1035,9 @@
     "importAndReplaceFromGridExplore": "Importer et remplacer à partir de GridExplore",
     "SaveToGridexplore": "Enregistrer dans GridExplore",
     "SaveToGridexploreError": "Une erreur est survenue lors de la sauvegarde dans GridExplore",
+    "MergeIntoComposite": "Créer une modification composite",
+    "MergeIntoCompositeError": "Une erreur est survenue lors de la création de la modification composite",
+    "DefaultCompositeName": "Modification Composite",
     "CompositeNestingLimitReached": "Enregistrement dans Gridexplore Impossible : dépasserait la limite d'imbrication ({limit})",
     "diagramConfigCreationMsg": "Création de l'image nodale de zone dans {directory}",
     "diagramConfigUpdateMsg": "Mise à jour de l'image nodale de zone {item}",