Task groups help organize tasks differentiating in site, proxies, product, size, or however a user decides to divide up their tasks. A task group must be selected in order to create tasks.
Creating a Task Group
Select the task group drop down box, name the task group, and hit Create.
Deleting a Task Group
First delete all tasks within the group using the trash bin icon then select the trash bin icon again to remove the group.
You can quickly navigate between groups by holding SHIFT and the UP/DOWN arrow keys. SHIFT + UP goes up the list from whichever group is selected and vice versa for SHIFT + DOWN.