How can we give regular maintenance for the car which we sold to customer.

I produced a worldly and sent to customer. Now I person to supply regular work to the sold part.
How tin I show the work for the sold product. Consider the merchandise arsenic Car.
Do I request to usage CS oregon PP oregon PM oregon MRO and successful which scenarios

If CS however agelong SAP volition supply support. Or is determination immoderate different caller module disposable for handling this.