Remove an Item from a Custom Catalog
You can remove an inherited item from a Custom Catalog by creating an exclusion
In Merchandising Manager:
Search or navigate to the Custom Catalog you want to add an Exclude Rule
Click the Rules tab.
Click the + button, and then select Exclusion
A new window opens.
In the new window, select the item you want to apply the Exclude Rule to.
Rebuild the Custom Catalog to apply the new Exclude Rule.