When I cut the batting into manageable sized pieces, I put registration marks so I know where to whip stitch them together at. I do not cut the batting in a straight line. It has gradual curves (making the registration marks easier to line up). I do not duplicate those marks either. I would use an "I" on one, "II" on the second and so on. I have been known to cut my batting pieces on the diagonal, so there is no additional stress if the finished quilt is to be folded and stored.