Invenotry

Thanks, Rustler. We accumulate all costs on a trailer (service, parts, repairs, etc) so the sales people know how much they need to sell the trailer for to hit a specific margin. For example, a tarp system can easily be $25K which is upwards of 45% of the cost of the trailer purchase. I want to be able to accumulate all costs incurred under the trailer inventory item but any time I add something, it changes the QTY and therefore average cost. Is there any way to enter a Bill without a QTY? I have not been able to do that so far, it always adds QTY 1.