how do i restrict forum categories to specific users??

Enable this for the category:

Admin CP -> Users -> Permissions -> Node Permissions -> [select a forum] -> Private node

Then in the same area there is a box on the top of the page to set permissions for individual users. Basically you are denying all access to the category with Private node and then explicitly allowing individual users.

See this thread for more info about permissions:

http://xenforo.com/community/threads/1-0-0-b1-understanding-permissions.5830/
 
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