I do job costing in QuickBooks Pro Contractor.
Classes are supposed to help track larger groups.
Some examples I have seen is tracking say different mowing crews or company divisions and such.
I might want to track squirt and fert income and expense seperate from my other operations and like wise I may want to track each truck. Not that I have a fleet of trucks but I want to get the system fine tuned more so I can make better choices. I also would want to allocate overhead recover differently for each operation based on their use.
There are a lot of different options which is why I was asking if someone was using this feature and how they set it up.