After importing managers from the supervisor screen, it doesn't clear the list.
The tickbox functionality also doesnt work to select specific supervisors to import as managers, you must import everyone who is a supervisor in the list and makes all managers at once.
It would be much more effective if the tickbox functionality allowed you to select specific line items of supervisors which you wanted to import, and also if after a supervisor has been imported to a manager that it clears them from the list. This data is no longer relevant and should be cleared upon import.