Can I enter a supplier invoice number and an internal bill number

Hello Eoinnccoy, Welcome to the Community! You can have a supplier bill number if you were also looking for an internal bill number that you manually entered that the supplier would not see there is not a box for that. Are you using the Simple Start, Essentials, or Plus package? We may be able to offer a way around that based on the package you are on as there are custom fields available to add in some of our packages. Alternatively, you could use the memo field on the bill.