Background jobs restriction

Environment : We have CRM ( 1 CI & 2 DI ) and BW ( 1 CI ).

When the BW sends a request, the corresponding extraction job starts in CRM ( APP 1 or 2 ).

Is there a way to avoid the BW extraction jobs to start on the Dialog instances and run only on CI.

I guess we have to create one in SM61 - server groups ? If so where should i define the server group ( crm or BW ) ?

Thanks