Ok I hope I understand the question...
Under categories you have forums.
So like if you have Category Red under that you would have Yellow Green forums
Then under that you would have Category Blue under that you would have Forum Yellow etc.
For example at my site (
http://forums.iskirra.net) my category
Official Announcements (under that would be forums)
Announcements
Developers Circle
Contributor special area...
then would be my category General Forums
Which would have
General Discussion
A Bard's place
etc.
You set up the category and where you want them..
then you add forums to that category when you create them.
I hope this helps.
