Currently you have no way of knowing where your products come from, the way the script is set is so you can make a purchase order of a product from multiple suppliers, but most cases you can only buy a product from one supplier, no products can link to where they come from. You cant even select a supplier and see a list of what products from that supplier, ie like your supplier catalogue. This would be a great feature to keep your products organised and easily know where you can order it from.