Currently, when you want to limit the combining of promotions, there are only two options:

• Disallowing combining with ALL other promotions
• Define individual promotions that are disallowed

The difficulty arises when one tries to set up a promotion that should generally be combinable with all other promotions (like a general discount). One would have to go into ALL other promotions, potentially disable the check to disallow all other promotions, and then define all promotions manually that should not combine. Not only does this require significant effort, but it is also error-prone, since any potential combination has to be accounted for.

An improvement could be the possibility to define promotions as always combinable, irrespective of the settings of other promotions.

Another idea could be the creation of promotion groups that interact with each other in different ways, i.e. promotions within their group may not combine, but may combine with another specific group.

This would allow merchants to better control promotions without the risk of misconfiguration leading to wrong discounts for customers.