I would like to be able to "add" (addition = +) from my uploaded .csv-file. So if current stock for an item is = 6, and in my .csv I have the number 4 to be added, so the total is now 10 for the stock for a particular item. I'm guessing that this can be accomplished in the "optional: edit values" field, when doing import. But how? Pls explain.
