Pushing a policy for usergroup and calling station id from Free Radius Server

Hi, I am using free radius on Linux, Fedora 13. I am able to push policy for a user.. I need help on two scenarios given below. 1.how to push policy for a specific usergroup from free radius sever 2. how to push a policy for a specific Calling-Station-ID like 00:16:6F:A2:XX:XX [ no user specific policy returned] Thanks in advance. Regards, Subhani