You can use the driver with two different Groups functions:
Zigbee cluster Groups, in which the device will receive commands directly from another zigbee device that is in the same group and without going through the Hub. These group number are configured in preferences and you can see the device Groups numbers set in the bottom of the details view, Get Groups capability
Mirror Groups created with bulbs that are paired in this same driver and receive commands from the driver and are managed with a child device that controls all the functions of the bulbs in the group.
In this link it is detailed how these Mirror groups work, which have nothing to do with zigbee groups