Here is my reply to another thread on the same topic:

This seems, for lack of a better word, idiotic. See the attached screenshot. You have the tables set up already where it would make it extremely simple to update different vendor pricing for each item. The only way to actually do this is through the add/edit multiple entries under vendor items and even then its extremely limited. No drop down to choose the item, you have to type in the item exactly as it appears. Oh and wait. if you have multiple levels of categories you need to add those as well separating the categories and succeeding sub categories all the way down to the name of the actual item by a colon. but wait, there's more, All this was found out after spending 2.5 hours with tech support. This is beyond ridiculous for a multi billion (yes BILLION) dollar company. I am extremely disappointed. We upgraded 5 licenses to enterprise and will be cancelling and reverting back to pro. Get your act together intuit!!