Step 1: Create Design of Every Part of Car..
1st create part modeling...
2nd assemble all parts..
3rd do drafting...
Step 2: Rendering in CATIA V5
go to "photo studio easy tools" option in catia tool bar..
click on that option n render tool appear
in render tool bar choose background for car...
then define renderd area
click on render option..
then wait for some min...it wil create car background