If your store uses price groups to support multiple currencies, you can specify that a promotion applies only to items purchased in specific currencies. For example, suppose you create a price group called GBP that lets shoppers view prices in British Pound Sterling. You can then create an order discount called “Spend £100, get £10 off” that applies only when a shopper displays your store’s prices in British Pound Sterling and then purchases £100 worth of merchandise. See Understand currency-specific promotions for more information.
