Multiple domain/subdomain forums

[grandfso]

Hello, there is something I wish I had done, but I am not sure how to name it, so I can't be sure if a hack like this has been already made, or not.
Let's say you have your board running on one database, the board is accessible from www.myboardurl.com. On this board you have some categories with some subforums, everything looks like this:

-Category 1
--subforum 1
--subforum 2
--subforum 3

-Category 2
--subforum 1
--subforum 2

-Category 3
--subforum 1
--subforum 2
--subforum 3
--subforum 4

My question is: Is there a way to make your vBulletin engine to serve only one category, with specified skin when the board is being accessed from another url. For example, when you go on cat1.myboardurl.com, you will see _only_ Category1 and its subforums, with customized skin?
or another example: after visiting totally different domain(also parked) like www.fantasticvBulletinBoard.info to see _only_ category 2 and category 3 with its subforums?
And of course when you visit www.myboardurl.com you will see all three categories, with default skin. Threads, users and other settings should be shared.

How can I do this? Thanks in advance!
Kind regards,
grandfso