Costing inventory between busines units

Summary:

we have the following scenario in a single company there are 4 business units

Spare Parts BU

workshop BU

Used Vehicles BU

New Vehicles BU

Used Vehicles BU receives a car in its inventory but needs to make repairs, Workshop BU provides this service, but Workshop BU buys the parts it needs to repair this car from Spare Parts BU, then Workshop BU charges for labor Vehicles Used BU, at the end this car needs to add the additional costs for spare parts and labor, this car does not enter by PO it is part of negotiation because a client bought a new car for the sale of this new car exists New vehicles BU.