Access the account you want to add a jet card or money on account to
Click on the "Cards/Contract" tab
Enter the relevant information and click "Save" (Note: Jet Cards can be setup by dollar or flight hour amounts)
Apply the jet card to the invoice.
In the event that you choose to setup the jet card based on hours, the hours will be deducted based on the hours indicated in the invoice.
The invoice will reflect balance after.