The result:
When I click on the main category, I get a page with a description of the category, and all the products listed below in grid form (I tweaked it to do this). I also see the main category on the left side bar and below it is a list of all the products (sub categories) that I can click on. So far so good . . .
What is wrong:
When I click on a product the categories go back the way they were (only displays the main category, no sub categories).
What I want:
I want the code that will make the subcategories show up on every product page that is within the main category so that no matter what product you are looking at, you can switch to another product within that same category without going back to the first page.
Does this make sense?

I need the template name and the code to replace. Seems like it shouldn't be too hard I hope.
Thanks in advance!