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Hi there, @shire39.
Welcome to the Community. Yes! You can add transaction manually from previous year even the bank account is closed. Follow the steps below:
For more visual guide on how to add transaction manually, you can check out this article: Manually add transactions in QuickBooks Self-Employed.
Just in case, I've added this article for your reference: QuickBooks Self-Employed Overview.
Please don't hesitate to let me know if you should have any questions about this or anything else QuickBooks related. Have a wonderful day!