1. Go to "Component" -> Hikashop
2. Click "Orders" -> Select "Coupon"
3. Click "New"
4.1 Code = "2 Pieces Waived Shipping"
4.2 Shippping Percentage = "100%"
4.3 Minimun number of products = "2"
4.4 Category = "product category"
4.5 Including subcategories = "Yes"
4.6 Auto load in cart if possible = "Yes"
In front end, it will display as below
