There isn't anything like that in the base code. You would have to code it yourself and add something to post.asp that checked the forum the user was posting in and gave them the appropriate template accordingly.
After that, you could try and add something to post_info.asp that uses regular expressions to make sure the template is still intact when your users submit the form, or you could save yourself some trouble if you trust that your users won't make any changes to your template before submitting their post. You could also enable moderation in the forum in question to give you the opportunity to check each post before they are visible to the public.<