Domain alias needs to be more complex

First, lets give an example:
We have the domain: domainname.com and subdomain: subdomain.domainname.com
We need to add an alias for domainname, lets say: domain-name.com.
Normal it is that:
subdomain.domain-name.com should be an alias for subdomain.domainname.com and
domain-name.com should be alias for domainname.com.

I vote for a way to be done automatic in EHCP.

Thanks,
Razvan