Important thing needed in Multivendor

There is one big feature is missing

When we add product it multivendor should ask for vendor SKU number and the SKU number we needed to display on our website when the order comes in it should automatically send an email to the specific vendor not the price listed on our web site but the cost which we are buying that merchandise from that vendor, I am not sure if that multivendor addition design to work for that but I am looking for that feature as we buy from multiple different vendors and we so the invoice vendor will receive for new orders will consider as PO.