This is a sample of what your digital index sheets will look like.  Click on a photo on the left to see that page.  Click on the right-side image to bring up a full screen view that can used to review and select individual frames for scanning.  You would simply enter the Row # and Frame # (like R3F2) into the Comments block on the bottom.  Index sheets show the "average" exposure for all the frames on that page.  Under or Over exposed frames may still be "good" photos when scanned and exposed individually.