Reading through this I’m not sure if the recommendation to first do the manual process followed by the OrcaSlicer or use OrcaSlicer in lieu of the Bambu Lab manual bed leveling. Doing both obviously won’t hurt, but does cost time.
Reference the Manual Bed Leveling the " engineering plate is the opposite is the opposite side of the PLA plate and is plainly marked. “But” (always a but [Behold the Underlying Truth]) because a user may have simply never had a reason to look/pay attention to whats on the opposite of the PLA side of the plate, I wanted to make a suggestion the manual leveling page explain the engineering plate is the opposite side of the PLA plate, but a quick look doesn’t show any way to make suggestions).