Is it necessary to assign the buss master to a group?
It is not necessary to assign the buss master to a group. But, if you would like to control the buss master from Satson grouping, you should do it.
If you are unable to locate the solution you are looking for, and you have a Sonimus account, you can still get help by creating a client support ticket.
If you don't have a Sonimus account create a guest support ticket.