Moving an individual forum into a new site (domain)?

[FlyBoy73]

I have a forum category (and the forums within it) that I want to split off from the main site and give its own dedicated community at a separate domain. I realize this requires another vBulletin license (etc) and that is no problem. What I would like to know is how involved is it to move all of the content (about 100k posts) into the new forum?
To take it one step further, it would be nice to also copy the active members (or all who posted in there) accounts over to the new site, though not critical.

I suppose I could copy my entire site over and then go to deleting everything besides this forum and these members but that would be a big PITA I am guessing since we have over 1,000 forums, 150k+ members and 3.7M posts total..

I'd appreciate anyone's input on this. The most important thing is moving that category's forum content to the new site rather than just start over..

Thanks,
David