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Hello there, @mtmalc.
You'll want to check the transactions for a duplicate before you import it to your QuickBooks Self-Employed (QBSE). This way, we'll ensure there are no duplicates transactions.
Here are some great articles you read can read for reference in importing your bank transaction to QBSE:
Also, check this great resource that can guide you on how to add transactions in your QBSE account: Manually add transactions in QuickBooks Self-Employed.
Do get back to us if ever you need help with anything else. Keeping you in working order is our top priority. Keep safe!