3817021 - How do you remove Vehicle Types from the drop down list when doing a Ground search?

I would like to remove vehicle types from the Vehicle Type drop-down list that shows to the users when they do a Ground Search. We are set up with Summit Qwest for Sedan and SUVs.  We would like to remove Limo, Taxi, Van, and Shuttle from the drop-down list.

How do you remove Vehicle types drop down list that shows when you are doing a Ground search? , KBA , CON-CA-ADM , Administration , Problem