Autoenrollment of Certificate

I have been sent a certificate from a CA at a sister site that I want to be
able to distribute to all clients in our local domain. I want the cert I
have been sent to be auto-enrolled by our clients and placed in their
'Trusted Root Certificate Authoritites' container. CA (and subordinate CA)
are Win2k3 native. Clients are XP and 2000.

If I manually import the certificate, it works fine. I don't though seem to
have any auto-enrollment control over imported certificates on our CA.
Auto-enrollment options seem to be controlled through certificate templates
that I configure and publish into A/D myself.

Is there any way to acheive this, or do I have to resort to manual imports
using certutil.exe in the login script?