Below is a photo showing what I did. I use my curved ruler. I mark at center back the height of the amount I want to remove (2/3") - then I place one edge on the side seam corner, and the other on my mark at center back and mark the new cutting line For this pattern, I have created full-size pattern pieces - so next I flip the ruler and mark the same adjustment on the other side of the bodice. I make sure to put the same ruler mark (3) at the center back when I flip it, so that the curve is the same on both sides.
