At KidCheck, we refer to this as ‘Load Balancing’, and it is a feature available to our Premium and Campus Editions customers. There are two possible load balancing configurations for organizations to choose between:

Sequential – where one classroom is filled to capacity before children are assigned to the second room
Balanced – where child #1 is assigned to the first classroom, child #2 to the second classroom, child #3 again to the first room, and so on

To view detailed instructions and screenshots on how to set up load balancing for your organization, please visit the tutorial.