Pretty sure that it is.
It's just a straight A type record, with a value of *
You can make the value just * and signify the suffix as same as parent folder, so if the forward lookup zone you are creating the new record in is Mydomain.com, the record would end up being *.mydomain.com
If you define any other straight mappings, they will be read before the wildcard.
So
Mydomain.com
WWW A 192.168.0.1
* A 192.168.0.2
Your www would map to 1, while all others to 2.