Unfortunately you can't remove your information from your 2021 return to put it in your 2020 return. You will need to start a new return using the specific tax year that you are filing for. File Past Years' Income Tax Returns | TurboTax® Canada (intuit.ca)
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Unfortunately, if you need to do a return from 2020, you'll have to start over and log in to your 2020 return.
