Campaigns combined with other campaigns
You can allow several campaigns to be applied to the same order, or limit the number of campaigns that can be applied.
When there are many campaigns active at the same time, it might not be desirable for some of them to be applied to the same order at the same time. On other instances, it might be ok for a customer to get benefits from two campaigns inside a single order.
This is controlled by a radio button on the General tab when you create or edit a campaign.

The concept of campaigns that can be combined together is easily explained through an example.
Suppose the following two campaigns are active at the same time.
- Campaign A: Give a specific product a campaign price.
- Campaign B: Free delivery.
If Campaign A and B are allowed to be combined together, given their conditions are met, a customer can enjoy both the campaigns on a single order.
However, if Campaign A and B are not allowed to be combined together, even if both of their conditions are met, a customer will only enjoy one of them on a single order. The one applied will be the one with higher priority.
In case the conditions are not met for the one with higher priority (Campaign A), then the campaign engine will evaluate the lesser priority campaign in line (Campaign B), and if the conditions are met, customer will get Campaign B.