How do I define a "zone" (for lack of a better term) so that I can do an include that only shows up in one particular child forum?

Here's an example of what I'd like to do: I'm starting a forum about sports. It has a main sports forum and then child forums (sub categories) like - Sports>Basketball Sports>Football etc. In the basketball forum I'd like to include an advertisement that links to a baskteball statistics website. BUT I don't want to include that advertisement in any of the other forums. Besides advertisements I could see a need to do things like this for graphics or other types of includes.

Is that possible?

TIA
Paul