We'll make a decal that we can apply to our truck when we open Xara 3D 3.

Make a duplicate of the rectangle and the symbol. Select the symbol and set the fill to none. Leave an outline to act as a guide.

Create three rectangles as shown, one for the cab, one for the back of the vehicle, and one for the light bar. Make two ellipses slightly larger than the wheels as shown.

Select all the objects, set the outline to none, and Export, (File menu) as a 24-bit PNG file. Name your file decal.png