What do you mean "create" it, "manually"? The tab or the relations within the tab? 

Hi Quan,

Thank you for the replay.

I need to get the referred product details by directly pass product id.

So that I decided to read the default "Belongs To" property.

Now I found the solution.

I used the IRelationRepository to get the referred product details.

The code,

var relationRepository = ServiceLocator.Current.GetInstance<IRelationRepository>();

 var contentlink = referenceConverter.GetContentLink(55, CatalogContentType.CatalogEntry, 0);

var testrelation = relationRepository.GetParents<NodeRelation>(contentlink);

Thank you.

But Quan,

I need to create relations with tab manually.

I need some blogs explanations.

https://world.episerver.com/documentation/developer-guides/commerce/catalogs/catalog-content/Categorizations/

should be pretty clear.

Create a new relation and call the UpdateRelation on the repository.

Hi Erik,

Thank you for the replay.

I created a new reference by using the following code.

            var Child = referenceConverter.GetContentLink(56, CatalogContentType.CatalogEntry, 0);
            var parent = referenceConverter.GetContentLink(1073741908, CatalogContentType.CatalogEntry, 0);

            //Add the product reference to one Category
            var relations = new NodeRelation  {
                               Child = Child,
                               Parent = parent
                                         };
            var relation = (relations as Relation);
            relationRepository.UpdateRelation(relation);

Thank you