Do you know how to change the model of a car with p3d editor?

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Is that I want to make a mod of a car but know how to change the model and put the textures to a car?
Open the car file with Lucas Pure3D Editor 4.5. For example if you want to edit the Hover Car open it and import/replace frinkv_Shape
But the bigger the car the longer it takes to edit. Every single vertices needs to be triangular not squared