yeah, using 3ds max atm because I prefer it over blender. What I am trying to achieve is to add whitelines on track zones where usually there are none.This is a little too vague... Can you elaborate on what you need? Runoff areas?
You'll need to import the existing track into a 3d modelling software, which im assuming you did?
Take that escape road at T1 in Barcelona this year as an example.
I don't necessarily need a new piece of tarmac, just a method to add whitelines on the track for runoff areas and escape roads.