There is not one right way to make the switch.
For some lucky parents, their baby tastes whole milk and happily never looks back. For others, it's a game of slowly introducing the milk mixed with formula in gradually increasing amounts.
Offering the milk in a cup instead of a bottle and cool right out of the fridge is a good way to start. Then the milk is seen as a new drink and not a substitute for formula. There is no right answer, so do what feels right for your baby.