Newbie DNS Question

[Marcus]

    I am new to the whole DNS thing. I have always been given a primary and
secondary DNS to give to say network solutions then my domain name works.
Anyways now I am setting up a sub domain was told I needed to change my DNS
configuration so that my subdomain (test.allinonemortgage.com) resolves to
my IP (216.217.195.96).... Any suggestions? I am running Red Hat Linux 6.1
and Apache.