Groups are used to segment your users into different cohorts, allowing you to more easily manage their training, progress, and reporting in bulk.
To create a Group, click on Users and Groups and select Groups, then click on Create New Group.
Give the Group a name, then click Create.
The Courses & Learning Paths tab lets you assign training to the Group. Members will be assigned the training as soon as it's added to the Group, or when they first join the Group.
Use the drop-down menu in the upper-left to select the training and use the Assign button to add the training to the Group.
The Members tab is where you add users to the Group. This is done using the Enrol Users button in the upper-right.
Settings will allow you to modify certain aspects of your Group, such as its name and whether users can self-register using the enrolment link.
Finally, clicking on Create a Sub Group will create a new group under the current group in a vertical hierarchy.
This lets you recreate any sort of organizational hierarchy you need. Here is an example of what it can look like.