Bexar County offers various forms for vehicle transactions, including application for disabled parking placard and license plate (VTR-214), certified copy of title (VTR-34), and property tax forms. Texas Motor Vehicle Bill of Sale: Provides information about the vehicle (e.g., make, model, condition) and confirms acceptance of the "as is, where is" condition. County of Harris. §. Register or renew your vehicle registration in Bexar County, TX at any of the 19 auto title service locations or Bexar County Tax Office locations. The State of Texas requires that you complete a bill of sale if you buy or sell a car or boat within state boundaries. This video will show you how to fill out your Texas title, notice of vehicle transfer, and application for title.