So I'm late to the party on this topic but I agree with several other posts. The workaround is to have a Product & Service item as part of the bundle that reduces the price of the total. I've set them up in the past with a taxable discount item and a non-taxable discount item so services combined with products in a bundle can be adjusted separately. On the other hand, if pricing and tracking retail assemblies is the objective, a point of sale system or app should be what keeps the inventory pricing details and QBO only used to summarize income from sales. Even some POS apps like Square don't handle assemblies though so it may take some looking to find the right solution. The lack of this function doesn't really diminish QBO's effectiveness, it's just not part of it's intended purpose.