I am assisting a client with swapping his web sites around. In the end, he would like to end up with the primary domain www.domain.org on a separate server (and hence different IP) than several existing aliases of that domain name. Those aliases are in the form alias1.domain.org, alias2.domain.org, etc.. I am calling them aliases because that is currently how they are configured in DNS. EDIT I'm not sure if they are actual CNAME records as I cannot find a record listing in Plesk that specifically includes these.
My question is what should I be considering in terms of DNS for those aliases once the www.domain.org record points to another server. Should those "aliases" be turned into sub-domains?
It almost seems like it would be easier to just change the A record for www.domain.org since all the subs will point to the same (existing) server, but I'm not sure that it can be done that way, although this question makes me think that perhaps it is possible.
If I need to map this out to make it clearer, please let me know. I'm new to posting on SE sites.