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Added Costs on Vehicles

You CAN do that, but why would you want to?

You will lose 100% of your ability to track you advertising expenses when you throw it into C/S. The only time I could see this type of thing making sense is something like a "listing fee" to Ebay Motors or a site like that, but even then I wouldn't do it.

Explain why you are thinking of doing this. That may help.