Multiple user ranking system

[MW[MWGN]]

I want to have for different forums a different user ranking system...
i.e. when you get to 50 posts, I want some forums to get a different title, instead of all the same.....
Anyone understand what I mean?
Right now, for all forums, it's like this.
Post 0-20 Boy Scout
Post 21-50 Private and so on.....
but I want for certain forums to be like this
Post 0-10 Newbie
Post 11-20 Veteran and so on......
how would I do that?