Use this when you want to prevent specific products — such as accessories or add-on items — from being sold on their own, and require them to be purchased only alongside products from a specific category.
By combining Complementary with ④ Excluded items, you can create a restriction that allows bundling only with products from a specific category.
This example uses a snowboard shop to explain how to set up a restriction where a snowboard bag can only be purchased together with a snowboard.
Snowboard bag only → Not allowed
Snowboard bag + snowboard → Allowed
Snowboard bag + snowboard wear → Not allowed
Cart contents | Result | Reason |
|---|---|---|
Snowboard bag only | Not allowed | Eligible item only — standalone purchase not allowed |
Snowboard bag + snowboard | Allowed | A non-eligible, non-excluded item is present |
Snowboard bag + snowboard wear | Not allowed | Snowboard wear is an excluded item and is removed from the check, so the bag is treated as a standalone purchase |
Snowboard only | Allowed | No eligible items in cart — rule does not apply |
Prepare a collection or product tag in advance that includes all products you do not want customers to purchase together with the snowboard bag (i.e., all products other than snowboards and snowboard bags).
Field | Value |
|---|---|
① Title | Enter any title |
② Limit details > Bundle limit level | Complementary |
③ Eligible items | Snowboard bag |
④ Excluded items | The collection or tag of products you do not want purchased together with the snowboard bag |
⑤ Product message | Enter any message |
⑥ Alert message > Display timing | Fixed to Checkout only (cannot be changed) |
⑥ Alert message > Message | Enter any message |
When Complementary is selected, the alert message Display timing is automatically fixed to Checkout only. Displaying an error on the cart page is not supported.
Setting Bundle limit level to Complementary means the eligible item (snowboard bag) cannot be purchased without other products.
Products set in ④ Excluded items (such as snowboard wear) are removed from the restriction check entirely — even if they are in the cart, the bag is still treated as a standalone purchase.
This ensures that the snowboard bag can only be purchased when a snowboard is in the cart.
Combining Complementary with Excluded items allows you to create a restriction that permits bundling only with products from a specific category.
Products set as Excluded items are completely removed from the bundle restriction check. Add products you do not want purchased alongside the eligible item — such as snowboard wear — to Excluded items.
It is important that products you want customers to purchase together with the eligible item — such as snowboards — are set as neither eligible items nor excluded items.
Using collections makes it easy to manage the configuration without changes, even as your product catalog grows.