You can look at the PDF archives of your previous tax returns to see what donations you entered and use that information to determine which where claimed on Line 34900 – Donations and gifts. This TurboTax Canada FAQ tells you how to get a printable PDF copy of your TurboTax Online tax return: How do I print a copy of my tax return in TurboTax?

You can login to TurboTax Canada Online 2022 here: https://ww1.2022.ca.turbotaxonline.intuit.com/

You can login to TurboTax Canada Online 2023 here: https://ww1.2023.ca.turbotaxonline.intuit.com/

You can login to TurboTax Canada Online 2024 here: https://ww1.2024.ca.turbotaxonline.intuit.com/

Thank you for your quick reply.

The PDFs are the the finished tax forms -from what I can see-  what I need to access is the actually workpages of my previous years, where I would have filled out all the information.   I entered the names and amounts of deductions that were not claimed that year.    It should be saved somewhere.   Any ideas?

You can login to the previous years and open the returns. The donation section will have any receipts you entered.