Forum category feature
 

I’m wondering if vbulletin allows for the display of all messages of a sub forum in a parent forum. For example, in the forum below, a parent forum houses all the threads of its sub forums (elect, games, comp). When you post to the parent forum, it actually forces you to select a sub-forum to categorize your post.

http://www.redflagdeals.com/forums/hot-deals-f9/

In this sense, the sub forums really just serve as categories of a much bigger forum.(I also want the threads being displayed in the parent forum to denote which sub-forum the thread belongs to). Is this possible with vbulletin? Or is there a mod that makes this possible?