Copying Client Programs copies the progression spreadsheet as well.
Currently, when you map out several days in the calendar you can edit those days in a progression spreadsheet. However, if you try to copy that program over to another client it only copies the "Workout Builder" portion and not the calendar changes.
Master Programs if "scheduled" copies to clients program. That way if you periodize 6 weeks, you don't have to re-type every change for every client on every exercise.
Client programs if "scheduled" copy over changes made to the "progression spreadsheet". The master workouts tab doesn't allow for planned periodization and often forces me to write down notes for myself to use in the "progression spreadsheet" or map it out in the master program tab.