Setting a subdomain as an alias

[lesda]

Hi guys!

I would like to set a subdomain (e.g. static.mydomain.com) as an alias to mydomain.com to serve static content through this url. Until now my ISP used Plesk, and everything worked fine, but in ispCP Omega I can not set this thing up, because it says "a domain already exists with this name".

I think there should be a way to achieve this.

Currently as a workaround I actually created the static.* subdomain and redirected to the main one, but I would like to avoid these redirects.

Thanks for your help!