Fix subdomain Cname/A Record issue - subdomain "server IP address could not be found" - 30/04/2018 20:57 EDT by MediaDaveT

I need to amend the Cname or A Record for the subdomains I have set up to the main domain for gasadnoil.com.au The main domain works perfectly, but subdomains setup with CPanel return the message "server... (Budget: $10 - $30 AUD, Jobs: DNS, Linux, PHP, Web Hosting, WHMCS)