There are times when a Customer is required to pay for a fill prior to delivery. These funds can be placed in Unapplied Cash, which can then be applied to the Ticket upon delivery.
COD Customer
In this example, the Customer is a COD Customer and they have made a $200 payment prior to delivery. The funds have been placed in UAC. The COD checkbox is automatically selected when invoicing the delivery, and a Roll-Through Payment screen will display automatically.

Upon saving, a window will display giving the driver the ability to print the ticket.

The Roll-Through Payment window will then display. Check Use UAC to apply the funds to the ticket.

Non-COD Customer
The Roll-Through Payment screen also displays when the Take a Payment box is checked prior to saving the ticket.
This Customer (non-COD) has $200 in UAC. Select the Take a Payment checkbox, and choose Save.

Apply funds from UAC as the payment for this ticket by checking the Use UAC checkbox. Select Save to finish the payment.