Searching for this feature and noting how long people have been looking for this!  We used to have it on our desktop version and it is vital for projections-- it's all fine and great to know which customers want my things, but does not help if I can't get a clear picture of WHAT they want!  Additionally, we used to enter these as purchase orders (which has now moved into MY purchases, which I do not need to track so much).  Anyway-- PLEASE QB engineers, build in this feature which has existed in your software previously.  PRODUCT LINE ITEM ESTIMATES