How to use price books to add discounts automatically?

How to use price books to add discounts automatically?

Hey,

I am testing Zoho and I have created a product, which has a flat quantity discount.

When I create a quote with a quantity that fits the discount range, the discount is NOT automatically added to the sub total. I am required to type in the discount. What are the price books for then?

I want that if the quantity matches a range in the price book, Zoho automatically calculates the discounted price. How can I achieve this?