There are a few ways you can do it. First, you can do it through sales and purchases (e.g. hedge a certain percentage of the total sales or purchases volume). Then, you can check the exposure at the end of each day, week, or month (e.g. hedge a volatile currency based on its weight on overall sales volume) or you can see the net exposure at a certain exchange rate range (e.g. hedge a certain percentage of the total sales volume when the exchange rate falls within a certain range [‘limit order’ or ‘stop order’]).