How to scrap blueprints

@sparks1581 you don't have to do anything, the game automatically scrap the BPs when you already have all of them for one car. For example lets say that you have all the BPs for Subaru BRZ, if you get more BPs in a regular or premium crate or as a race prize then the BPs will be scrapped. In the other hand, if your question is to scrap BP for a car that still doesn't have all of them, then the answer is you can't scrap the BPs