If your submitted jobs are pending (bjobs shows the job in PEND state), you can modify job submission parameters. You can also modify entire job arrays or individual elements of a job array.
You can modify your own job groups and job groups that other users create under your job groups. The LSF administrator can modify job groups of all users.
The command bmod -g cannot be combined with other bmod options. It can only operate on pending jobs.
It cannot operate on running or finished jobs.
You cannot move job array elements from one job group to another, only entire job arrays. A job array can only belong to one job group at a time.
You cannot modify the job group of a job attached to a service class.