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In the use case here, our store sells medical garb and wants to use the promo code to encourage the purchase of matching tunic and trousers. For the promotion, the trousers has been enabled as a Master product. It, along with the matching tunic, are added as Child products.  A customer must buy one of each to get the tunic at a discount price.      

We can now go to Promotion Codes to create the promo code.

1. Follow steps 1-4 to reach the Promo codes page.
   
   
2. Enter details of the promotion code as required. Here is an example:
   
   
   
3. Click Save and Exit. The promo is active from the start date to the end date.
   
   

Let's say your customer adds the eligible product to their order, in this case, the medical scrub trousers, and also adds the matching tunic. In the Shopping Cart, before adding the promo code, the normal prices are displayed. After applying the promo code, the special price on the discount product is calculated.
Note - your customer could have also brought up the discount by adding just the correct number of eligible products, going straight to the Shopping Cart, and entering the promo code.