Hmmm I read your question 3 times and I'm still not sure I understand it

But I want to help if I can
how to pre-populate message areas for posting a certian post criteria
Do you mean when you hit the "reply" button to a post? And if so do you want each forum to have different standards? Where does the data that fills out the certain parts come from? User input? Or predefined per forum?
Just a few questions
/JD