Car Category

Hi, I would like to add car category in the input field e.g. truck, bus, pickup etc. How do I do that from the plugin? I would also want to be able to use the field in the short code to sort out display eg [jpro_cars title=”” make=”all” model=”all” year=”all” fuel=”all” condition=”all” mileage=”all” price=”all” category=”bus”][/jpro_cars]