So the answer is still no - I can't import max quantity.
I already know how to copy/paste - fine if you can be sure the items are in the exact same order in Excel and QB, with no additional or missing items in either. Anything added, missing, or out of order, will mess up lots of items. Since I have many thousands of items, and a spreadsheet that just has the items I need to update with min and max, I would really prefer to avoid copy/paste.
I'm thinking I can make this happen by exporting everything from QB, then use a formula to copy over my max numbers, so I'll have a spreadsheet with everything instead of just the items I want to update. I'm hoping this will make it easier to ensure all items are in the same order with none missing. But this is causing me some anxiety!! I'd much prefer to just import it like I import everything else!
