help subforum question

[Brian31fl]

okay what i need is to beable to make subforums from 1 cat and a subforum inside another sub with out its looking like crap in top level
ragezone is a good exsample http://ragezone.com look at H-M them Muonline as you see there subs inside a sub wondering how to do this if i itry it messes up the subs 2nd level