You can create a bundle discount to offer promotions that will automatically apply when a specific combination of products is added to the cart.
How to create bundle discount
Go to Admin > Discounts and click
Create Discount
Choose
Bundle discount
Set your discount code parameters:
Discount Value: Percentage or fixed amount discount rate
Select bundle products: Assign the product combination that will trigger the discount
Minimum purchase requirement: Not applicable / minimum purchase amount / minimum quantity of items
Maximum discount usage: Not applicable / total usage / usage per customer
Active dates: the starting and end date (if applicable)
You can test the bundle discount on your checkout page
