In addition to using stacking rules, merchandisers can specify include and exclude behavior on the Availability & Coupons tab of the Promotion asset type. These settings override the combinations allowed by the stacking rules, and therefore allow you to create exceptions to those rules when required.

Important: Include and exclude exceptions should be used rarely, to prevent confusion as to exactly when promotions apply.

The Promotions to exclude collection editor allows you to define individual promotions that cannot be combined with the current promotion (in addition to any stacking rule exclusions). For example, Promotion A may be included in Stacking Rule 1. Stacking Rule 1 combines with Stacking Rule 2, which includes Promotion B. You do not want Promotions A and B used together, so you add Promotion B to the Promotions to exclude list on Promotion A.

The Promotions to include collection editor allows you to make similar overrides in the other direction. For example, Promotion C may be included in Stacking Rule 3. Stacking Rule 3 does not combine with Stacking Rule 4, which includes Promotion D. You want Promotions C and D used together, so you add Promotion D to the Promotions to include list on Promotion C.

Note that if a promotion has already been applied to an order and that promotion excludes another promotion, the excluded promotion cannot be re-included by any promotions that apply later in the pricing process.