Click the +Add top-level department button.
Update the department name, then click the Add button to complete.
Click the Plus icon on the Department that you need to add a sub-department.
Update the Sub-Department name, then click Add to complete.
You're able to edit or delete the Department after being added
Edit: Click the Pencil icon on the right > Edit information then click Save.
Delete: Click the Trash icon on the right > Click Delete