When you are adding in your teams of editors you will specify how many jobs that editor can accept per day. There can be a case where you shoot more jobs than your assignment queue defines.

IE

Editing Team 1 can edit 10 jobs

Editing Team 1 can edit 15 jobs

-Total of 25 jobs

You shoot 30 jobs that day - this is 30 needed jobs vs the 25 that the editing team can handle.

The editing team that has the "Assign Overflow" will get the extra (5) jobs