There are a few things you need to do in order to make a Barbie Doll car. First, you will need some supplies that are specific to car making. For example, you will need a drill, saw, screws, nails, and other materials needed for the construction of cars. Second, you will need some Barbie Doll parts. For example, the front and back of the car must be made out of plastic so that they can be glued together. The rest of the car must be made out of cloth or other materials so that it can be painted and decorated as desired. Finally, you will need to create a model of the car using 3D software such as AutoCAD or Inkscape. Once your model is complete, you can begin building your own Barbie Doll car!