To create a payment for an open vendor bill directly, you can click on Register Payment at the top of the form.
From there, please select the payment method (Bank, cash, etc…) and the amount you wish to pay. By default, KIU will propose the entire remaining balance on the bill for payment. In the memo field, we recommend you set the vendor invoice number as a reference (KIU will auto fill this field from the vendor bill if set it correctly).
You can also register a payment to a vendor directly without applying it to a vendor bill. To do that, go to Accounting-> Vendors-> Payments. Then, from the vendor bill you will be able to reconcile this payment directly.