Sub forums issue

[uofa]

"First Year" is under the forum "English" and 121 , 122,.... are all under "First Year". so like this:



What i would like it do is so when i click on "English" it only shows "first year", second year, third year...and NOT whats inside the first year forum(121,122) in the next window. so NOT like the way it does right now in the below picture



How would i go about doing this ? im running vbulletin 4.2 and here is the address to my site.
http://uofaforums.ca/forum.php

thanks in advance.