When you say function do you mean nothing shows up in the product edit screen?
You should get a dropdown menu showing all the categories in the products set. Make use that the set id matches what you've added into the Category app. You can only list categories from one set within one perch:categories pair of tags so you will need to use multiple pairs if you have more than one set of categories.
As an aside, because product pages tend to be quite complex, it might be easier for you to have one template for editing the products and another for displaying them. Then you don't need to worry about suppress or conditionals cluttering up your product edit template.
Thanks for that. I had added no categories to the products set, instead created new sets with categories. Working well now
Also thanks for the other tip, will do that now.