Domain Mapping cname vs. a name

Hey guys.. I am a little confused...
Ok.. I set up the domain mapping on my network install, it's network activated.. and available to all sub sites.
The main domain is
The sub domain is craighunt.automated.chruch
The domain I wish to point to "" is ""
""'s is hosted with Godaddy, and it's nameservers are pointed to my cloudhosted account. So is.. my domain too..
So they share the same IP..
So my question is..:
Which record do I change ?? And then after I change it.. what do I do on the subsite, under the domain mapping section??
Cause it says to change the A record.. but the A record is acually the same IP, as the multisite main domain.
Thanks in advance!