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I'm here to help import multiple your invoices in QuickBooks Online, core-billing.
You need to use the required invoice fields during the import. Your custom fields should match what's in QuickBooks to have a successful process.
To do so, you can download this sample spreadsheet to map each of the column headings.
Once your spreadsheet is ready, here are the steps on how to upload it:
You can also refer to this article for additional information: Import multiple invoices at once.
Stay in touch with me if you need anything else about the process above. I'm always right here to help import your invoices to QuickBooks.
You may also prepare the Invoice data with the following template
then utilize an importer tool