currently Schedule 3 supplemental statement only have two pages, which is not enough for me. How to add more pages ?
You can group together similar items and just put in the totals. You can use a program like Excel, Google Docs or Open Office to work out the totals, and that way you have a document that you can show the CRA if they request it.
If you will need more forms and you can't group together what you have in the two forms it would be best that you Print to Mail your return so that they get all your information.