When applying a custom vinyl group onto a car, the masked layers go through the vinyl group, but they also go through all of the other vinyls already on the car.
The masked layers should apply only to that saved group, and not go through external vinyl groups - peering all the way to the base paint. They should only be masked within that saved layer group.
Because when I apply a saved layer group that has masking, it overtakes the vinyls beneath it also.