diff --git a/osm-openapi.yaml b/osm-openapi.yaml
index 919223f..4478965 100644
--- a/osm-openapi.yaml
+++ b/osm-openapi.yaml
@@ -2085,6 +2085,174 @@
           $ref: '#/components/responses/UnexpectedError'
         default:
           $ref: '#/components/responses/UnexpectedError'
+  /nslcm/v1/subscriptions:
+    get:
+      tags:
+        - NS instances
+      summary: Query information about multiple NS instance subscription
+      description: Query information about multiple NS instance subscription
+      operationId: getNsSubcriptions
+      responses:
+        '200':
+          description: OK
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/ArrayOfNslcmSubscriptionInfo'
+            application/yaml:
+              schema:
+                $ref: '#/components/schemas/ArrayOfNslcmSubscriptionInfo'
+        '400':
+          $ref: '#/components/responses/BadRequest'
+        '401':
+          $ref: '#/components/responses/Unauthorized'
+        '403':
+          $ref: '#/components/responses/Forbidden'
+        '404':
+          $ref: '#/components/responses/NotFound'
+        '405':
+          $ref: '#/components/responses/MethodNotAllowed'
+        '406':
+          $ref: '#/components/responses/NotAcceptable'
+        '409':
+          $ref: '#/components/responses/Conflict'
+        '422':
+          $ref: '#/components/responses/UnprocessableEntity'
+        '500':
+          $ref: '#/components/responses/InternalServerError'
+        '503':
+          $ref: '#/components/responses/ServiceUnavailable'
+        5XX:
+          $ref: '#/components/responses/UnexpectedError'
+        default:
+          $ref: '#/components/responses/UnexpectedError'
+    post:
+      tags:
+        - NS instances
+      summary: Create a new subscription for the Network service
+      description: Create a new subscription for the Network service
+      operationId: addNsSubcriptions
+      requestBody:
+        $ref: '#/components/requestBodies/NslcmSubscriptionRequest'
+      responses:
+        '201':
+          description: Created
+          headers:
+            Location:
+              schema:
+                type: object
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/NslcmSubscriptionResponse'
+            application/yaml:
+              schema:
+                $ref: '#/components/schemas/NslcmSubscriptionResponse'
+        '400':
+          $ref: '#/components/responses/BadRequest'
+        '401':
+          $ref: '#/components/responses/Unauthorized'
+        '403':
+          $ref: '#/components/responses/Forbidden'
+        '404':
+          $ref: '#/components/responses/NotFound'
+        '405':
+          $ref: '#/components/responses/MethodNotAllowed'
+        '406':
+          $ref: '#/components/responses/NotAcceptable'
+        '409':
+          $ref: '#/components/responses/Conflict'
+        '422':
+          $ref: '#/components/responses/UnprocessableEntity'
+        '500':
+          $ref: '#/components/responses/InternalServerError'
+        '503':
+          $ref: '#/components/responses/ServiceUnavailable'
+        5XX:
+          $ref: '#/components/responses/UnexpectedError'
+        default:
+          $ref: '#/components/responses/UnexpectedError'
+  '/nslcm/v1/subscriptions/{nsSubscriptionsId}':
+    parameters:
+      - name: nsSubscriptionsId
+        in: path
+        required: true
+        description: Network Service Subscription ID
+        schema:
+          type: string
+    get:
+      tags:
+        - NS instances
+      summary: Read information about an individual Network Service Subscription
+      description: Read information about an individual Network Service Subscription
+      operationId: getNsSubcriptionId
+      responses:
+        '200':
+          description: OK
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/NslcmSubscriptionInfo'
+            application/yaml:
+              schema:
+                $ref: '#/components/schemas/NslcmSubscriptionInfo'
+        '400':
+          $ref: '#/components/responses/BadRequest'
+        '401':
+          $ref: '#/components/responses/Unauthorized'
+        '403':
+          $ref: '#/components/responses/Forbidden'
+        '404':
+          $ref: '#/components/responses/NotFound'
+        '405':
+          $ref: '#/components/responses/MethodNotAllowed'
+        '406':
+          $ref: '#/components/responses/NotAcceptable'
+        '409':
+          $ref: '#/components/responses/Conflict'
+        '422':
+          $ref: '#/components/responses/UnprocessableEntity'
+        '500':
+          $ref: '#/components/responses/InternalServerError'
+        '503':
+          $ref: '#/components/responses/ServiceUnavailable'
+        5XX:
+          $ref: '#/components/responses/UnexpectedError'
+        default:
+          $ref: '#/components/responses/UnexpectedError'
+    delete:
+      tags:
+        - NS instances
+      summary: Delete an individual Network Service Subscription
+      description: Delete an individual Network Service Subscription
+      operationId: deleteNsSubcriptionId
+      responses:
+        '204':
+          description: No Content
+        '400':
+          $ref: '#/components/responses/BadRequest'
+        '401':
+          $ref: '#/components/responses/Unauthorized'
+        '403':
+          $ref: '#/components/responses/Forbidden'
+        '404':
+          $ref: '#/components/responses/NotFound'
+        '405':
+          $ref: '#/components/responses/MethodNotAllowed'
+        '406':
+          $ref: '#/components/responses/NotAcceptable'
+        '409':
+          $ref: '#/components/responses/Conflict'
+        '422':
+          $ref: '#/components/responses/UnprocessableEntity'
+        '500':
+          $ref: '#/components/responses/InternalServerError'
+        '503':
+          $ref: '#/components/responses/ServiceUnavailable'
+        5XX:
+          $ref: '#/components/responses/UnexpectedError'
+        default:
+          $ref: '#/components/responses/UnexpectedError'
 # END NS Instances
 
 # BEGIN NetSlice Templates
@@ -5765,6 +5933,15 @@
         application/zip:
           schema:
             $ref: '#/components/schemas/NetSlicePackage'
+    NslcmSubscriptionResponse:
+      description: NslcmSubscriptionResponse
+      content:
+        application/json:
+          schema:
+            $ref: '#/components/schemas/NslcmSubscriptionResponse'
+        application/yaml:
+          schema:
+            $ref: '#/components/schemas/NslcmSubscriptionResponse'
   # END RESPONSES
 
   schemas:
@@ -7829,6 +8006,172 @@
         - type
         - url
       additionalProperties: false
+    NslcmSubscriptionResponse:
+      type: object
+      properties:
+        id:
+          type: string
+          format: uuid
+        filter:
+          type: object
+        CallbackUri:
+          type: string
+          format: uri
+        _links:
+          type: object
+    NslcmSubscriptionInfo:
+      type: object
+      properties:
+        _id:
+          type: string
+          format: uuid
+        _admin:
+          type: object
+        schema_version:
+          type: string
+          format: 'X.Y[.Z]'
+        CallbackUri:
+          type: string
+          format: uri
+        filter:
+          type: object
+        authentication:
+          $ref: '#/components/schemas/Authenticationschema'
+    ArrayOfNslcmSubscriptionInfo:
+      type: array
+      items:
+        $ref: '#/components/schemas/NslcmSubscriptionInfo'
+    NsInstanceSubscriptionFilter:
+      description: |
+        used to identify the network service
+      type: object
+      oneOf:
+        - $ref: '#/components/schemas/nsdIds'
+        - $ref: '#/components/schemas/vnfdIds'
+        - $ref: '#/components/schemas/pnfdIds'
+        - $ref: '#/components/schemas/nsInstanceIds'
+        - $ref: '#/components/schemas/nsInstanceNames'
+    nsdIds:
+      type: array
+      items:
+        type: string
+    vnfdIds:
+      type: array
+      items:
+        type: string
+    pnfdIds:
+      type: array
+      items:
+        type: string
+    nsInstanceIds:
+      type: array
+      items:
+        type: string
+    nsInstanceNames:
+      type: array
+      items:
+        type: string
+    Nslcmsubschema:
+      type: object
+      properties:
+        nsInstanceSubscriptionFilter:
+           $ref: '#/components/schemas/NsInstanceSubscriptionFilter'
+        notificationTypes:
+          description: |
+            If NsLcmOperationOccurrenceNotification is selected then at least operationTypes or states is required. If NsLcmOperationOccurrenceNotification is selected then at least nsComponentTypes, lcmOpName and lcmOpOccStatus is required
+          type: array
+          items:
+            type: string
+            enum:
+              - NsIdentifierCreationNotification
+              - NsIdentifierDeletionNotification
+              - NsLcmOperationOccurrenceNotification
+              - NsChangeNotification
+        operationTypes:
+          type: array
+          items:
+            type: string
+            enum:
+              - INSTANTIATE
+              - SCALE
+              - TERMINATE
+              - UPDATE
+              - HEAL
+        operationStates:
+          type: array
+          items:
+            type: string
+            enum:
+              - PROCESSING
+              - COMPLETED
+              - PARTIALLY_COMPLETED
+              - FAILED
+              - FAILED_TEMP
+              - ROLLING_BACK
+              - ROLLED_BACK
+        nsComponentTypes:
+          type: array
+          items:
+            type: string
+            enum:
+              - VNF
+              - NS
+              - PNF
+        lcmOpNameImpactingNsComponent:
+          type: array
+          items:
+            type: string
+            enum:
+              - VNF_INSTANTIATE
+              - VNF_SCALE
+              - VNF_SCALE_TO_LEVEL
+              - VNF_CHANGE_FLAVOUR
+              - VNF_TERMINATE
+              - VNF_HEAL
+              - VNF_OPERATE
+              - VNF_CHANGE_EXT_CONN
+              - VNF_MODIFY_INFO
+              - NS_INSTANTIATE
+              - NS_SCALE
+              - NS_UPDATE
+              - NS_TERMINATE
+              - NS_HEAL
+        lcmOpOccStatusImpactingNsComponent:
+          type: array
+          items:
+            type: string
+            enum:
+              - START
+              - COMPLETED
+              - PARTIALLY_COMPLETED
+              - FAILED
+              - ROLLED_BACK
+    Authenticationschema:
+      type: object
+      properties:
+        authType:
+          type: string
+          enum:
+            - basic
+        paramsBasic:
+          type: object
+          properties:
+            userName:
+              type: string
+            password:
+              type: string
+    NslcmSubscriptionRequest:
+      type: object
+      properties:
+        filter:
+          $ref: '#/components/schemas/Nslcmsubschema'
+        CallbackUri:
+          type: string
+          format: uri
+        authentication:
+          $ref: '#/components/schemas/Authenticationschema'
+      required:
+        - CallbackUri
   # END SCHEMAS
 
   requestBodies:
@@ -8110,6 +8453,14 @@
         application/yaml:
           schema:
             $ref: '#/components/schemas/CreateK8sRepoRequest'
+    NslcmSubscriptionRequest:
+      content:
+        application/json:
+          schema:
+            $ref: '#/components/schemas/NslcmSubscriptionRequest'
+        application/yaml:
+          schema:
+            $ref: '#/components/schemas/NslcmSubscriptionRequest'
   # END REQUEST BODIES
 
   securitySchemes: