Normally, if your domain is pointed to erudeye's name server it would
be no problem at all to add any subdomain to your websites. But
recently i got a case where my domain, which is hosted somewhere, and
its subdomain need to be hosted in
erudeye.net.
The solution is simple, just create A record in your DNS Server and
point its IP to 72.232.63.122. In Erudeye's control panel, simply add
new domain for the website.