Once you have created the pre-assigned breakout groups, those groups will be ready to go whenever you are ready during your class session. For more instructions on how to initiate the breakout groups you have previously created, visit the official zoom instructions here.
Zoom also allows you to revert back to pre-assigned breakout groups. This is helpful if a student joined the meeting after you have started the breakout groups, or if you had more than one set of breakout groups.
Note: If students are not logged in to Zoom before joining your zoom session, you may still need to manually assign them to a group before opening the rooms. This might also be the case for external guests who do not have a georgetown Net ID.
Check out this documentation for managing breakout groups for help managing breakout groups when you are already in the session.