As I mentioned before, the bottom section of the S3 Supp comes from your T5008 T-Slips. It can't be erased without removing the T5008 slips.
The top part of the section on Schedule 3 titled "Publicly traded shares, etc..." is filled in either by typing directly into the form or through the Capital gains pages in EasyStep mode. If you enter the same information that was on your T5008 here, then your capital gains will be double. You can just delete the information if there is duplication.
