Two separate breakout room sessions in one meeting

[EuroLung]

I am running a meeting where I would like to have two separate breakout sessions each with several breakout rooms, one in the morning and one in the afternoon. For each breakout session I want to pre-assign attendees to each room, as each will have a nominated facilitator. But I would like a different mix of people in each room in the afternoon compared to the morning. Is there any way of doing this? Or can I allocate a facilitator to each room and then have the other attendees randomly assigned?