Hi there, have you tried to manage it with Project option in Dolibarr? You may create a project for Car 1, another one for Car 2 and so on. When you are processing an expenses invoices for fuel for example for for Car 1 you may attached this invoice to the project of Car 1. Then if you have a customer that use this car and you are sending to this customer an invoice for the service then again this customer invoice can be attached to the same project (Car 1 for example) and so on. And when you go to this project and open the Overview tab you will see all expenses and incomes for the Car 1 and the profit of the project. At the same time it will allows you to use the Accounting module as you are using it at the moment.
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