Driver's license information can be entered and stored in FlightBridge for any passenger or crew profile at the time of rental booking.  This information is not currently accessible in the profile under the Pax/Crew listing but it will be stored in the background and auto-populate for future bookings.

Begin your rental booking and after you select the traveler, you can click the driver's license icon to open the modify window where you can enter and save the driver's license number, country and state as well as contact phone and email.  Once you complete the rental booking, this information will be stored to the profile behind the scenes to be passed along to the rental car company on future bookings.