I tried CustomPress as per this post https://premium.wpmudev.org/forums/topic/marketpress-custom-fields-1#post-158300
It seems to work ok though I guess it will take some "custom coding" as David mentioned.
Before I launch into that, am I heading in the right direction?
I'm building a site for a wholesaler. He needs to add APN barcode numbers (just the number, not the barcode itself) to each product. This number will be unique for each product. He needs to have them visible with the product description for his customers to see. Then if the store he supplies to wants to add a new product to their shelves they just copy the APN and setup their stock control and pricing software ready for when the new stock arrives.
Is CustomPress the best way to add custom fields to MarketPress for my purposes?