Hi there, silverhillgroup1.
You can input old invoices in QuickBooks my importing them manually through CSV file. You’ll just need to open your import invoice toll, upload CSV file and map column headings. For further information, about this process, please refer to this article: https://quickbooks.intuit.com/community/Getting-Started/How-to-import-invoices/m-p/261968
Don’t hesitate to visit us again if you have other questions about QuickBoosk.
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