Prestashop Extension for price breaks and handling price according to weight.

Hey, I want a Prestashop Extension for the price break of my products like If I have a "product1" which has so many products itself included so display the price break on the front end and calculate prices of all mixed products according to their quantity dynamically. I don't add the product price I only add their sub-product's small quantity price and then "product1" price will be calculated on frontend and price break will be shown to the user.