This can also be used with Undo History to apply a PolyGroup to all strokes made after the marked undo point. *PolyGroup by Changed Points will allow the last stroke to be converted to a PolyGroup. This can also be used with Undo History to apply a mask to all strokes made after the marked undo point.
Store a point of view and swap back to it as needed with Stager.Design with Precision using the Knife brushes.