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Create a level-1 group.
Click "Add group" in the first column to create a level-1 group: A, B
In the pop-up interface, enter the level-1 group name A, click "Save", repeat the above steps,
and create B.
Create a level-2 group.
Select "A" and click "Add group" in the second column to create level-2 groups of A: A-1 and A-2.
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