When the same product or customer is included in different discount campaigns, you may want to control how the discounts are applied.
Scenario 1: Exclude products already on sale
If certain products are already discounted site-wide (i.e., using "compare-at price" specified by our app or manually), you can exclude them from other discounts.
There are two main cases, depending on which discount you want to block from applying to sale items.
a) For Alpha Sale in-cart discounts
To make sure your Alpha Sale coupon codes and automatic discounts never apply to sale items, use the exclusion option during the "In-cart product discount" setup:
b) For your own existing Shopify codes
If the codes you need to block were created outside Alpha Sale, use a blocking rule (Ultimate plan needed).
When setting up your blocking rule, choose Items on sale as your protected products. The rule then watches whether the customer's cart contains any reduced-price items and blocks the code if they're present, showing the message you set.
Scenario 2: For products with both a sale and an in-cart discount, apply the largest.
If you want the largest discount to apply when your sale products are eligible for other types of discounts (e.g., a $50 price reduction and a 10% discount code), this is also easy to arrange.
Set all your “In-cart product discounts” and “In-cart order discounts ” to be calculated based on "compare-at price". This default option will ensure your sales don’t stack with checkout discounts.
Scenario 3: Combining several in-cart product discounts
If you have several in-cart product discounts (which you created in the Shopify admin panel, Alpha Sale, or any other app), you can choose whether or not they should combine.
Mark the “This product discount can be combined with” -> “Product discounts” checkbox. When selected, only the largest discount applies.
You can read more about discount combination rules in the Shopify knowledgebase.
Scenario 4: Combining in-cart product and order discounts
You can control whether in-cart product and order discounts stack.
Choose “This product discount can be combined with” -> “Order discounts” to apply both discounts in sequence (first the product discount, then the order discount).
Note that for this setting to work, your order discount should also allow combinations with product discounts.
Scenario 5: Combining discounts with shipping offers
You can also decide if discounts should be combined with shipping offers.
In the same settings box, select “This product/order discount can be combined with” -> “Shipping discounts” to apply both the product/order discount and the shipping discount.
Scenario 6: Quantity discounts with other discounts
A quantity discount works as a product discount in Shopify. You set how it combines with other discounts in its Combinations settings, the same way as for in-cart discounts.
With sale prices, a quantity discount always stacks: it's calculated from the product's current price. To keep it off sale items, exclude those products in Campaign exclusions, one by one or by collection, vendor or tag.
With other product discounts (for example, an in-cart product discount on the same item): if the discounts can be combined, only the largest one applies to the item.
With order discounts: if both discounts allow it, the quantity discount applies first, and then the order discount applies to the new total.
With shipping discounts: both apply if both discounts allow it.