You can't merge accounts with TurboTax. If you are using a different account with a different username and password for 2020, that account won't be tied to your 2018 and 2019 returns. You would still need to access them through the previous username and password you used when you create the returns. You can only clear and start over in TurboTax Online for the current tax return which is 2020.
We protect your Intuit Account with the latest technology for privacy and security. Unfortunately, this doesn’t allow a safe and secure way to merge multiple accounts. It’s best to use the same Intuit Account when you use TurboTax each year and to use the same user ID and password for all experiences on the Intuit Platform, including TurboTax, Mint, and QuickBooks Self-Employed. This helps our products work better for you and keeps all your info safe in one account. @Larry Converse
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