[kh99]

I didn't try that, but you should be able to. I believe it's done by adding additional parameters, like:

...&forumchoice[]=22&forumchoice[]=23&forumchoice[]=24

BTW, I noticed my post above could be confusing because I edited and removed a paragraph, but just to be clear, using include=35 should also work, even without the contenttypeid. But in that case specifying multiple forums would be like this: include=22,23,24. So that will work with a link (and the resulting link is easier to read) but to have a form with a list to select from (like the OP wanted) then you need to use forumchoice[]. (I hope that makes sense).