Do you use a different record for each unique combination of car type and Job type?
I think you need a Summary Report for what you want here. See this tutorial on summary reports: Creating Filemaker Pro summary reports--Tutorial
Well, I kind of solved this problem using conditional value lists, but it seems like I am missing some final touches there, and things doesn't work the way I expected. So if you can help me I would send you the project file, and then I will explain the whole thing to you.
your help is highly appreciated.