Yes, they should add up. It will be hard without seeing an example, at least for me. The only thing I can think of is if you have a fixed cost, it will show the total cost for the lot size, so then it won’t add up unless your lot size is still defaulted to 1. You might try looking at the costing on the method tracker. If you go to actions and view costs it gives you a breakdown of the costs by material. That might give you a clue, though it doesn’t show the lot size or what parts are fixed quantity either.