https://www.nationalcar.it/en/support/car-rental-faqs/add-emerald-club-number-to-reservation.html
How do I add my Emerald Club Member number to an existing reservation? | National Car Rental
If you have already set up a reservation but forgot to add your Emerald Club number, National Car Rental is here to help.
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https://www.buffalo.edu/administrative-services/business-travel/travel-expense-reimbursement-system/travel-expense-training-resources/add-car-hotel-to-existing-reservation.html
Add a Car or Hotel to an Existing Reservation - Administrative Services Gateway - University at...
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