If you'd like to setup your domain to accept anything.domain.com, you can do so with the following guide (Admin access required)
1) Setup the dns with a wildcard A record. Go to Dns Control, and add an "A" record:
* -> 1.2.3.4
where 1.2.3.4 is the IP of your domain.
This will allow anything.domain.com to resolve to your server. Apache does not yet know how to direct that name though.
2) To setup apache, go to:
Admin Level -> Custom Httpd configurations -> domain.com
In the top text area, add this *one* line:
ServerAlias *.|DOMAIN|
then click "Save".
That should be it. Wait a few minutes for everything (apache, named) to be restarted then test it out.
