You should click on Skip Import if the import screen pops up. You can click on Start or Update next to the Stocks, Cryptocurrency, Mutual Funds, Bonds, Other category. Answer YES when asked if you have investment sales, then Skip Import.
You should land of the Investment Type page where you choose the type of investment. Choose the type, scroll down and click Continue.
If you already have investments, click on Add investments to be taken back to the import page, that you can skip. You can click on Review next to any transaction to edit that transaction.
The amended return should start out at $0 and only reflects the changes from your originally filed tax return.

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