Wouldn't you be able to close the forum you have now. Then make a backup. Install the new vBulletin on the new domain. Then restore the database there. Then open the new forums (as it would be closed because you closed before getting database) and delete all the other forums, sub forums, and posts that you don't want on the new forum.
Then open the old forum. Then delete the category the other forum as. That way. You will have two forums. No duplicate posts. The member database will be the same on each site. However you can delete them if you wish.
EDIT: Didn't realise someone already suggested it.
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