Thank you Ariell,
So after talking with a live QBO agent, come to find out that Spreadsheet Sync will allow for the actual selection and addition of customs fields on the spreadsheet sync template for expenses/sales receipts, however, the tool does not work for expenses at this point (only bills/invoices from what I was told).
A little frustrating that they have already begun phasing out tags for custom fields, yet this option for bulk-editing custom fields to accommodate is not available. I can't find another method to bulk edit expenses' custom fields.
Thanks!
