How to add users into group

Hi  I was checking the option how to add users into groups. The ideas is to have different groups with Cisco AV pair and other parameters, and users that belongs to those groups. I was not able to find such an option, since huntgroups offers the group of the NAS clients. Like this: user1   Cleartext-Password := "user1"   // should belong somwhow to the group1 Group1               Service-Type = Framed-User,                      Framed-Protocol = PPP,                      cisco-avpair = "group1;" Many thanks