How do I add a group set in a course?
Note: The Groups page displays a limit of 50 group sets.
Create Group Set
Name the new group by typing in it the Group Set Name field .
You can allow self sign-ups by selecting the Allow self sign-up checkbox .
You can automatically split the groups in a number of equal groups by clicking the Split students into [number] groups radio button  and then typing the number of groups in the dialog box.
You can manually create the groups by clicking on the I'll create groups manually radio button .
Click the Save button .
Note: Except when creating groups manually, you can automatically set student group leaders.