JW Scheduler allows one congregation at at time. This generally means a Language Group and their members would be created under and added to the main congregation.
However if needed, you may also setup a Language Group as a separate congregation. You will need to please use another computer, or setup a Virtual Machine, and will need another License.
JW Scheduler offers the following support for scheduling Language Groups:
Scheduling the Midweek Meeting for a Language Group
Scheduling the Weekend Meeting for a Language Group
JW Scheduler does not currently support scheduling the Weekend Meeting or Public Talks for a Language Group.
If this is required, please either schedule manually, or set up another Congregation in JW Scheduler for the Language Group. You will need to please use another computer, or setup a Virtual Machine, and will need another License.