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Managers remove shifts from the shift board by unposting the shift.  A shift can be unposted for a couple of reasons:

1.  Manager doesn't want shifts to be posted for pick up

2.  Manager has reassigned the shift to someone else

To remove shifts from the shift board:

1.  Click on the shift board icon

2.  Click on the check box beside the shift(s) you want to remove 

3.  Click on Unpost Selected shifts

The shift(s) will now revert back to the employee(s) calendar and be removed from their "My Posted Shifts" icon.  

Note:  When you reassign a shift to someone it does NOT remove the shift from the shift board.  The reason it isn't removed automatically from the shift board is because some organizations reassign the shift as a last resort to ensure if it doesn't get picked up someone will work it.  However, they are still looking for someone to pick up the shift.