Hi Team,

I have configured Parent child relationship between Datatypes in umbraco using Multinode Content picker.

Now I want to append more relationship in backend. Can you please help to guide me how i can achive this.

using (var cref = _umbracoContextFactory.EnsureUmbracoContext())
                {
                    var categoryContent = _contentService.GetById(new Guid("8e138bc7-d38c-4508-a5fb-ed48b701f6c0"));
                     IPublishedContent publishedContent = cref.UmbracoContext.Content.GetById(new Guid("8e138bc7-d38c-4508-a5fb-ed48b701f6c0"));

                    var storeContent = _contentService.GetById(new Guid("a5dd1ea8-01ae-44c0-9cd8-42fe3929f890"));
                    var categoryProperty = storeContent.Properties.Where(x => x.Alias.ToLower() == "categories").FirstOrDefault();
                    var cateValues=categoryProperty?.GetValue("en-us");
                    storeContent.SetValue("categories", categoryContent.Key,"en-us");

                    _contentService.SaveAndPublish(storeContent);
                }

I am using ContentService but not able to add content.