Multiple Discounts Per Order
In some cases you don’t want the customer to receive multiple discounts. That’s where the configuration of the promotions comes in. Of course you can disable individual promotions that you don’t customer to receive at all by removing the checkmark in the “Published” checkbox.
More interestingly you can configure a promotion to not allow following promotions if the criteria of the current promotion is satisfied. Combine this with the priority of individual promotions and you can effectively control which discounts the customer is awarded based on your business rules.
You can prioritize promotions by going to your campaign's promotions and dragging them in the desired order.