On the Home page, locate the Refile option next to your electronically filed return. Adjustments can be made to a previously filed tax return. The CRA requires that you wait until you’ve received your Notice of Assessment (NOA) before filing an adjustment. In many cases, the CRA will catch the mismatch and automatically adjust your return for you.
For more information and guidance, refer to this TurboTax article: I've filed my tax return. Can I still make changes?
Thank you for choosing TurboTax.