Each stacking rule asset includes one or more promotions that you want to treat as a group. Rules are intended to prevent simple combination strategies, for example to keep customers from combining BOGO offers with gift with purchase offers. Make sure that the business logic behind each of your stacking rules is clear and well-understood before you implement them, and that each rule is truly necessary.
Each promotion can only be associated with a single stacking rule. Each stacking rule can include any number of promotions up to the number set in the “Maximum promotions per stacking rule” property. Within a stacking rule, promotions are applied to orders according to the promotion’s priority (see Creating Promotions in this chapter for information on the Priority property).
Stacking rules have the following behavior:
If an order qualifies for more than one promotion, and those promotions are linked to mutually exclusive stacking rules, the promotion with the highest priority is applied, and all other promotions are skipped.
If you specify that Stacking Rule X is not combinable with Stacking Rule Y, then Y cannot be combined with X. If you change the combine list on one stacking rule, the affected stacking rule is automatically updated.
Any promotion that is linked to a stacking rule that is excluded from use with the current stacking rule cannot be applied.
