Jessica: We agreed with the PO, and squid is coming. How to pay my bill?
Now that the order is fulfilled, it is time convert the purchase order into a vendor bill for actual bookkeeping!
Go to Expense > Purchase Orders. Find the PO, and select "Convert to bill" in its "Action" menu.
The data in the purchase order will be brought into a new vendor bill. The only difference is that you have to specify the Bill Number and Due Date in order to put it in the book and proceed to payments after.
In case the vendor bill differs from the original purchase order, you can adjust the items, quantities, unit prices and other related fields as well.
In real scenarios, there might be additional fees such as shipping charges, services, duties, etc.
For a detailed tutorial to record a vendor bill (vendor invoice), read here: