The Groups functionality is a way to bundle several users together and assign them to tasks they need to complete.
Follow the steps below to create a Group and add Users to it.
Navigate to the Personnel screen in Settings
Select the tab called Groups
Click on the "+ New Group" button in the top right
Enter the name of the Group you want to create
To add users to this Group, navigate back to the Users tab of the Personnel screen and for each User you can assign them to a Group from the Groups column