Unfortunately, you can't. You will have to refile all 3 previous years. 

If you have used TurboTax Online, you can use the ReFILE option by sign in to your account and, on the side of the NETFILE return, you will have a ReFILE button. In TurboTax Online, ReFILE is not available for Quebec residents.

If you're using TurboTax Desktop, when you open your 2024 software, you click on “Change a filed return”, choose the return you want to modify, click on modify return (in the NETFILE section) and follow the steps to apply the changes and ReFILE. If the steps are done in this order, the ReFILE button will be there.

In all cases, regardless of the software version used, you can do so directly in your My Account CRA and Revenu Québec, or by mail, by completing the following forms:

CRA: T1-ADJ T1 Adjustment Request
 

Revenu Québec: Request for an Adjustment to an Income Tax Return
 

Thank you for choosing TurboTax.