If you want to use wildcard subdomains and point them to your website make sure you have the following:
Make sure you have a wildcard DNS entry in Domain > DNS. You can add one as followed:
Set the “Record Type” dropdown to “A” and klick the Add button.
In the next screen enter a * (asteriks) in the domain name field, and enter the IP address your subdomain needs to point to.
Next, you need to create or edit the vhost.conf file for the domain:
The file is located at /home/httpd/vhosts/<domainname>/conf/vhost.conf
Open it, and add the line “ServerAlias *.<domainname>“.
Now run the following commmand:
# /usr/local/psa/admin/bin/websrvmng -a -v
Now all you need to do is restart apache.