I created a duplicate category so I move the 3 items I had in it to the new category with lots of items in it. Whe I tried to delet the now empty old category I get this message:

Are you sure you want to delete this category?

Warning: Linked Products whose Master Categories ID are deleted will not price properly. You should first assure that when deleting a Category that contains Linked Products that you reset the Product(s) Master Categories ID to another Category before removing a Category

First of all, the category is empty, so maybe this is a moot point, and nothing to worry about, but I can't find "master category ID" anywhere to reset. Do I need to change something on those 3 items (somewhere I can't find)before I delete this now empty duplicate category?