Inventory control

I am looking for a basic material list that would be kept an a plumbing service vehicle. I am trying to figure out what my initial inventory will cost upon opening a service business with a few trucks. Short of pricing each fitting individually at the supply house I was looking for a generic list I could customize as needed.

If anyone is aware of a way for me to do this I would appreciate the tip....Or I guess I will be in the supply house monday

Thanks Rick