Hello, @BRIANCoach

If you need to add a www for your domain - domain.com you can do both, e.g adding a CNAME record for www or just create an A record for db.domain.com

If you want to have a db.domain.com accessible with www as well, e.g www.db.domain.com you can setup an A record in the control panel.

Hope this helps!

Regards,
Alex