How do I setup a sub-domain redirect in Interworx like you can in cPanel. For instance, forums.mysite.com should go to mysite.com/vb/
Check out this thread, some options to make this this way are discussed there.
http://www.interworx.com/forums/showthread.php?t=2664&highlight=subdomain+rewrite
post #9 is probably the closest to what you want.