Ship Model Makers Anybody Know What Car Dealers Do With Cars That Doesn't Sell By The End Of It's Model Year?

Anybody know what car dealers do with cars that doesn't sell by the end of it's model year? - ship model makers

Examples: If a dealer has all the cars from the year 2006 and save the 2007-models of cars, which sell them with all cars from 2006? Are cars the previous year to reach the boat back to the car manufacturer?