How Can I Stack Discounts?

The system will always give the customer the best available discount. If you want multiple discounts to apply to an order then the promotions and coupons have to be put in a Promotion Set. 

Once you have your promotion and coupon discounts set up, select Promotion Sets at the top.

Commerce7-Promotion-Sets

Give the promotion set a title that is not customer facing. Then use the drop down menus under promotions and coupons and select "Add" to each discount you want to stack. Once you have all the discounts added select 'Save Promotion Set'. 

The order still has to have all the requirements set in each discount to apply and if they do then the discounts will apply together.

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For more detail on how Promotions and Coupons work with promotion set please review our documentation on Creating Promotions in Commerce7 and Creating Coupons in Commerce7