New Page Registering an Incoming Invoice If you need to register a single invoice for multiple trips at once, you can do so in one of the following ways: 1) Register an invoice from the Trip form.2) Register an invoice from the Open Trips window. 1. Registering an Invoice from the Trip Form Open the trip. Click the "Register Invoice" button. For an unconfirmed invoice, it is possible to add other customer orders. 2. Registering an Invoice from the Open Trips Window Navigate to the Open Trips tab. Select the trips for which incoming invoices have been received and click the "Register Incoming Invoice" button. Select the trips for which you want to register an incoming invoice. Click the invoice registration icon. Complete the required fields and click Save.