I need to create a new resource that include a pay per day and quantity parameters.
For example, I have a resource "Rented Car - Type 1" with 60€/Day as daily cost.
In my project, I have a task (10 Days long) that requires 5 rented cars. I need MS project to tell me that the total cost of this task is 10*5*60=3000€.
When the task duration changes, the cost will change automatically.