I Noticed that one can only create ONE sub forum from a category. What if i want to be able to create many su-forums for sub-forums for sub-forums? something like :

CATEGORY: 1
... sUB- FORUM : A
...... SUB-SUB-FORUM : a
.......... sub-sub-sub-forum : aa
..............sub-sub-sub-sub - forum : aaa
....................sub-sub-sub-sub-sub-forum: aaaa ..............etc etc etc
etc etc etc.... How do i create upto infinite sub-forums for sub-forums like that example above??