Promotion Tiered can also be explained with this scenario: When a customer buys 1 quantity of product, the discount will be 10%. But when the customer buys 2 quantities of products, the discount will be increased to 20%. This promotion tier can be used to provide promotions for many products, but want to provide tiered promotions based on the number of quantities bought.
Step 1. Go to Promotion, choose Promotion Event, then Click Add

Step 2. Fill out the Promotion Details
You can fill in the name of the promotion, then the outlet that can apply for the promotion, and the type of promotion can be set to Promotion Tiered, and don't forget to set the date of the Promotion Period.

Step 3. Choose Requirement Type, Add Variant/Category, then input Promotion Tiered Sample.
This tiered promotion can be entered by the terms of the promo that you want to apply. Then you can click the submit button.

[{"Quantity":2,"Discount":10},{"Quantity":3,"Discount":20},{"Quantity":4,"Discount":30}]
This means that if you buy 2 items on the purchase requirement list, you will get a 10% discount. If you buy 3 items in the purchase requirement list, you will get a 20% discount. And if you buy 4 items in the purchase requirement list, you will get a 30% You can use this template to customize the promo.
Step 4. You can click the sell menu, then enter the products in the promotion tiered earlier.
Enter the product by the promotion tier made. (Example: Denim Shirt (L) and Jacket (L)). Then a notification of available promos will appear. You can click the Promotion button at the top right.

Step 5. Apply for the Promotions.
Click on the apply button for the available promotion.

Step 6. Promotion Applied
The discount given is the same as the promotion conditions.

You might also like to read these articles below:
To make promotion the cheapest item, you can check this article Promotion Cheapest Item
To make a promotion with minimum spending, you can check this article Promotion With Minimum Spending Get Free Gift
To make a promotion discount for specific products, you can check this article Promotion Discount For Specific Products
To make a promotion Buy 2 Get 1, you can also check this article Promotion Buy X Get Y or Buy 2 Get 1
If you want to make a promotion discount on all products, you can check this article Promotion Discount All Product