To how many Groups can a device be added?

A device can be added to 32 groups

You can also visit the following sections for more information:
To know how to Commission & Configure Control Devices, click here
To know regarding Space settings, click here
To configure Scenes & Animations, click here
To configure Motion Based Automation, click here
To configure Daylight Harvesting, click here
To configure Light Schedules, click here