Wildcard dns

[Jillian]

Im using ispcp on my main server and I had little problem with manual dns records.
I have domain (domain.tld) in my main server and I have assigned sub domain (sub.domain.tld) to my second server.
Now Im trying to make new alias to second server (*.sub.domain.tld), but only get error:
Cannot validate A record. Reason 'Use of disallowed char("*") in NAME

Is there some other way to assign all *.sub.domain.tld records to second server?