domain pointer for the subdomain

hi frnds.

I have created a domain called mydomain.net
i have added a subdomain tim.mydomain.net ,
cynthia.mydomain.net and
harley.mydomain.net

          how could i add a domainpointer for these subdomains as well. So I can run jsp

on it.
Does any one have the idea how to configure this in Ensim control panel.