Is it possible for a category archive to include its own posts and all the posts contained in its subcategories?
I want categories to "roll up" the posts in categories below it. Say I have this structure:
Sports
--> Football
----> Oakland Raiders
----> Dallas Cowboys
----> [etc]
I want the "Sports" category to display it's own posts and the posts from "Football" and the posts for the teams. I want "Football" category to display its own posts and the posts from each team, etc.
Possible? If not in the core, is there a plugin?