set subdomain limits

I like to give some clients control over a own subdomain, but i want to set bandwidth and disk limit to those subdomains.
Is this possible?

Any other method to give multiple users access to their sql database and certain amount of bandwidth an disk?

Or is this only possible if each user has an own domain?

Tx,
Otto

found the answer:
http://www.directadmin.com/forum/showthread.php?s=&threadid=5471&highlight=subdomain+limits