Linking (and unlinking) groups is really easy. If you already have at least one group then whenever you create a new one we’ll ask if you want to link it to your other groups. You can update/rename or disband your collection of linked groups but clicking the settings icon next to the group collection label.
If you already have multiple groups which you’d like to link together, there’s a Link Groups button on the left-hand side drop-down panel.
When you link groups together, you have to give them a collective name, which will appear in a blue label to represent the collection of groups.