Platoon PH

Is there a way to set platoon phs?
I have seen some linescores where the other team has multiple phs and in the line score the yare referred to as "platoon ph". I am only aware of being able to set one ph against righties and one against lefties. In these line scores there are multiple platoon phs against the same arm.

It's on the page where you set your lineups. You'll see Backup 1, Backup 2, then Platoon PH.

Wow. never saw that.
Does that mean it will switch the platoon, even when you are already winning?

Yes. And it will platoon even early in game with lopsided score.