vBulletin 4.2 - How make subforums.. like 2 forums..

[Typhome]

Hello, i've brought license, but i want make 2 forums like:

>> Head - like: board.domain.com
- Community
-- Feedback
- Game
-- News
-- Another

And one forum (headforum) - like: board.domain.com
There will be:
- Community
-- Feedback

and two forum (game forum) - like: game.domain.com
There will be:
- Game
-- News
-- Another

I saw that one board had this feature and they said that they have only one license, so i want know how do make it.