More or less only for the high end models. Basically you apply for a model through the dealership > they send it to Italy where they accept it or not. If they do not they will usually offer you a lesser model first as you said. If they do then you get your car but you also have to sign a contract with them that they always have 1st call if you ever want to sell your car (if you break that they will never sell you again).

The big thing is that dealerships do not have new cars sat around on the lot waiting to be sold. They usually have second-hand cars available, but new cars are always built to order.