@GraceCeither my question has not been understood or deliberately not answered. My question is not to do with open balance or invoice number but rather what types of field variables can be used in an invoice other then [CustomerName] and the like see https://help.getharvest.com/harvest/invoices-and-estimates/get-started/recurring-invoices/ under the section Variables in Recurring Invoices and Messages for an example of what I am referring to. I would like to do something similar with my recurring invoices in QBO