If you mean to add or remove channels from group, you would use the MAP command. It is described in the CLI Reference guide on how to use.
If you are looking to separate channels from the same E1 (or T1) to 2 different groups, there is a restriction in that you are not allowed to do this if the line is E1 and/or it is a T1 ISDN/PRI.
MikeM
mike_voip@hotmail.com