Sensor groups are the new names that replace 'tagging'. Groupings allow an effective way to organize your triggers and applications.
Example Use Case:
Your company is interested in developing campaigns in a shopping mall, which has over 50 stores. Using groups, you may organize all your beacons and campaigns according to store, floor or any grouping logic that would organize your project.
How to add it?
Go to Triggers or Apps and press "+Create App group" or "+Create Sensor group" within Sensors.