Thanks for the info.
I knew that there are different places to do this, that's why I asked the question. But which one do I use for the product category on the product creation page, and what do I use on the dashboard page?
Can you just tell me which menu to go to to make this change? Like Config, then Display, then Product or whatever it is? The page you linked to isn't very clear. I just need to know where to go to display all the categories on the product creation page.
Also, unrelated, but it's not "edition" it's "addition." You ADD a product to the store. Edition means version.