Can WHMCS setup sub-domains?

I would like to setup a host where members can setup sub-domain.
I heard that WHMCS could take care of this, and wanted to make sure...
I have also heard that xPanel was good for this, but site seems to be down.

Something like:

3host.com

This is what it may look like after user signs up:
adultsexpage.3host.com

1: Need the ability to force ads
2: FTP access or file upload access
3: Ability for user to setup MySQL db
and so on....

Any info or how to set this up would be appreciated.

and is it possible to use multiple domains using WHMCS?

member.domain1.com
member.domain2.com
member.domain3.com

Thanks