In order to boost efficiency, you and your team can create logical groupings for sets of tasks. Groups can be workstreams, sprints, or any logical way to categorize a set of tasks. Below a few simple steps on how to create a task group.
Within List, click the button, "New Group +".
Type the group name and then click the button, "Add +".
You're all done. Your group has been created and now you can create tasks within the group.