Salva Hi Salva,
Sold last days will be the beginning for the new purchase order. So we have more brands where we order products weekly. Items sold in the last period need to be reordered. So from the list of last sold we make a new purchase order. :-)
Each variation or product has its own purchase price (same thing as with regular or sale prices)
I saw some plugins that offer the function to place one price for all variations. We sell clothing with different sizes and colors so the price is the same for all.
I use wp all import for importing products. There is a function to detect custom fields. I find a lot of fields but your Purchase price field is not to be found. Do you have a suggestion or wrok around?