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You'll have to export the missing transactions from your bank and then import them to QBSE. Let me guide you through how.
You can check this click to read the details about adding older transactions.
Once done, you'll want to review and categorize your transactions to bring them into your accounts.
If you have other questions about QBSE transaction, please let me know. I'd be glad to assist you some more. Thanks you for reaching out to us today. Have great day.