Welcome to the Community, @phil-higgs. I understand you'll need to add multiple supplier invoices or bills all at once.
This option is currently unavailable in QuickBooks. As a workaround, you'll want to consider using an importer tool from a third-party app compatible with QuickBooks. Visit our QuickBooks Apps page to search for one that fits best on your business.
I've got you this article for your future reference: Capture and categorise expense receipts and bills in QuickBooks Online.
Feel easy to post some more of your concern in the Community, @phil-higgs. I'm always around here to be your guide.