diff --git a/ccm-core-apiclient/src/main/typescript/clients/categorization-api.ts b/ccm-core-apiclient/src/main/typescript/clients/categorization-api.ts
index 48642434d..dcd561934 100644
--- a/ccm-core-apiclient/src/main/typescript/clients/categorization-api.ts
+++ b/ccm-core-apiclient/src/main/typescript/clients/categorization-api.ts
@@ -395,7 +395,7 @@ export class CategorizationApiClient {
             const response: ApiResponse = await this.#apiClient.get(
                 `${
                     this.#CATEGORIES_API_PREFIX
-                }/$domain/${path}/objects?limit=${limit}&offset=${offset}`
+                }/$domain/${path}/@objects?limit=${limit}&offset=${offset}`
             );
 
             if (response.ok) {
@@ -412,8 +412,8 @@ export class CategorizationApiClient {
                     list: objects,
                     count: result.count as number,
                     limit: result.limit as number,
-                    offset: result.offset as number
-                }
+                    offset: result.offset as number,
+                };
             } else {
                 throw `Failed to get objects in category ${path} of 
                 domain ${domain}:  ${response.status} ${response.statusText}`;
@@ -423,4 +423,223 @@ export class CategorizationApiClient {
             domain ${domain}: ${err}`;
         }
     }
+
+    async getObjectsInCategoryWithId(
+        categoryId: number,
+        limit = 20,
+        offset = 0
+    ): Promise<ListView<Categorization>> {
+        try {
+            const response: ApiResponse = await this.#apiClient.get(
+                `${
+                    this.#CATEGORIES_API_PREFIX
+                }/ID-${categoryId}/@objects?limit=${limit}&offset=${offset}`
+            );
+
+            if (response.ok) {
+                const result: Record<string, unknown> = await response.json();
+                const list: Record<string, unknown>[] = result.list as Record<
+                    string,
+                    unknown
+                >[];
+                const objects: Categorization[] = list.map((record) =>
+                    buildCategorizationFromRecord(record)
+                );
+
+                return {
+                    list: objects,
+                    count: result.count as number,
+                    limit: result.limit as number,
+                    offset: result.offset as number,
+                };
+            } else {
+                throw `Failed to get objects in category with 
+                ID ${categoryId}:  ${response.status} ${response.statusText}`;
+            }
+        } catch (err) {
+            throw `Failed to get objects in category with 
+            Id ${categoryId}: ${err}`;
+        }
+    }
+
+    async getObjectsInCategoryWithUuid(
+        uuid: string,
+        limit = 20,
+        offset = 0
+    ): Promise<ListView<Categorization>> {
+        try {
+            const response: ApiResponse = await this.#apiClient.get(
+                `${
+                    this.#CATEGORIES_API_PREFIX
+                }/UUID-${uuid}/@objects?limit=${limit}&offset=${offset}`
+            );
+
+            if (response.ok) {
+                const result: Record<string, unknown> = await response.json();
+                const list: Record<string, unknown>[] = result.list as Record<
+                    string,
+                    unknown
+                >[];
+                const objects: Categorization[] = list.map((record) =>
+                    buildCategorizationFromRecord(record)
+                );
+
+                return {
+                    list: objects,
+                    count: result.count as number,
+                    limit: result.limit as number,
+                    offset: result.offset as number,
+                };
+            } else {
+                throw `Failed to get objects in category with 
+                UUID ${uuid}:  ${response.status} ${response.statusText}`;
+            }
+        } catch (err) {
+            throw `Failed to get objects in category with 
+            UUId ${uuid}: ${err}`;
+        }
+    }
+
+    async addObjectToCategoryOfDomain(
+        domain: string,
+        path: string,
+        categorization: Categorization
+    ): Promise<string> {
+        try {
+            const response: ApiResponse = await this.#apiClient.post(
+                `${this.#CATEGORIES_API_PREFIX}/${domain}/${path}`,
+                JSON.stringify(categorization)
+            );
+
+            if (response.ok) {
+                const result: string = await response.text();
+                return result;
+            } else {
+                throw `Failed to add object to category ${path} of 
+                domain ${domain}: ${response.status} ${response.statusText}`;
+            }
+        } catch (err) {
+            throw `Failed to add object to category ${path} of 
+            domain ${domain}: ${err}`;
+        }
+    }
+
+    async addObjectToCategoryWithId(
+        categoryId: number,
+        categorization: Categorization
+    ): Promise<string> {
+        try {
+            const response: ApiResponse = await this.#apiClient.post(
+                `${this.#CATEGORIES_API_PREFIX}/ID-${categoryId}`,
+                JSON.stringify(categorization)
+            );
+
+            if (response.ok) {
+                const result: string = await response.text();
+                return result;
+            } else {
+                throw `Failed to add object to category with 
+                ID ${categoryId}: ${response.status} ${response.statusText}`;
+            }
+        } catch (err) {
+            throw `Failed to add object to category with 
+            ID ${categoryId}: ${err}`;
+        }
+    }
+
+    async addObjectToCategoryWithUuid(
+        uuid: string,
+        categorization: Categorization
+    ): Promise<string> {
+        try {
+            const response: ApiResponse = await this.#apiClient.post(
+                `${this.#CATEGORIES_API_PREFIX}/UUID-${uuid}`,
+                JSON.stringify(categorization)
+            );
+
+            if (response.ok) {
+                const result: string = await response.text();
+                return result;
+            } else {
+                throw `Failed to add object to category with 
+                UUID ${uuid}: ${response.status} ${response.statusText}`;
+            }
+        } catch (err) {
+            throw `Failed to add object to category with 
+            UUID ${uuid}: ${err}`;
+        }
+    }
+
+    async removeObjectFromCategoryOfDomain(
+        domain: string,
+        path: string,
+        objectIdentifier: string
+    ): Promise<void> {
+        try {
+            const response: ApiResponse = await this.#apiClient.delete(
+                `${
+                    this.#CATEGORIES_API_PREFIX
+                }/${domain}/${path}/@objects/${objectIdentifier}`
+            );
+
+            if (response.ok) {
+                return;
+            } else {
+                throw `Failed to remove object ${objectIdentifier} from 
+            category ${path} of domain ${domain}: 
+            ${response.status} ${response.statusText}.`;
+            }
+        } catch (err) {
+            throw `Failed to remove object ${objectIdentifier} from 
+            category ${path} of domain ${domain}: ${err}`;
+        }
+    }
+
+    async removeObjectFromCategoryWithId(
+        categoryId: number,
+        objectIdentifier: string
+    ): Promise<void> {
+        try {
+            const response: ApiResponse = await this.#apiClient.delete(
+                `${
+                    this.#CATEGORIES_API_PREFIX
+                }/ID-${categoryId}/@objects/${objectIdentifier}`
+            );
+
+            if (response.ok) {
+                return;
+            } else {
+                throw `Failed to remove object ${objectIdentifier} from 
+            category with ID ${categoryId}: 
+            ${response.status} ${response.statusText}.`;
+            }
+        } catch (err) {
+            throw `Failed to remove object ${objectIdentifier} from 
+            category with ID ${categoryId}: ${err}`;
+        }
+    }
+
+    async removeObjectFromCategoryWithUuid(
+        uuid: string,
+        objectIdentifier: string
+    ): Promise<void> {
+        try {
+            const response: ApiResponse = await this.#apiClient.delete(
+                `${
+                    this.#CATEGORIES_API_PREFIX
+                }/UUID-${uuid}/@objects/${objectIdentifier}`
+            );
+
+            if (response.ok) {
+                return;
+            } else {
+                throw `Failed to remove object ${objectIdentifier} from 
+            category with UUID ${uuid}: 
+            ${response.status} ${response.statusText}.`;
+            }
+        } catch (err) {
+            throw `Failed to remove object ${objectIdentifier} from 
+            category with UUID ${uuid}: ${err}`;
+        }
+    }
 }