if I understand your question ...
you will need to set some forums as "categories" ... you can do this by setting ACT AS FORUM to NO (admincp / forum manager)
Quote:
Act as Forum – setting this to no causes the forum to behave as if it were a category. This prevents posting in the forum and changes the template used to display the forum in the forum list.
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More info:
http://www.vbulletin.com/docs/html/forum_add_forum
Other settings you will need to consider: (found in vBulletin Options / Forum Listings Display Options)
Depth of Forums - Forum Home
Depth of Forums - Forum Display
Depth of Sub-Forums