What is the best way to add a large volume of supplier invoices? It takes so long!! We have hundreds of invoices each week

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. 

@phil-higgs 

Prepare the Bills data with the following template

then utilize an importer tool

https://transactionpro.grsm.io/qbo