Thank you for your question.
Per the CRA; You can request a change to your tax return by amending specific line(s) of your return. You cannot, however, refile a tax return once you have already submitted it. Be aware that before you amend your tax return, you must wait for your notice of assessment (NOA).
Here is a Turbotax guide on how to amend your tax return.
Here is an FAQ on how to amend your tax return.
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