Discount (%) on a Wholesale Location - set by an admin on the location's edit page - is the percentage taken off your regular meal prices (normal price plus portion upgrade) whenever that wholesaler orders stock through Purchase Stock. It does not affect what the wholesaler's own customers pay on Grab&Go: that price is set by the wholesaler themselves from their My Wholesale portal - either a Default Surcharge (My Wholesale > Settings, added on top of every meal's normal price for their location) or a custom Final Retail Price they set per meal (My Wholesale > Stock Management). Leave Discount (%) empty for no discount.