Look to do Dynamic Pricing & Discounts for my store

I found a woocommerce plugin called WooCommerce Dynamic Pricing & Discounts which works prefect but now I'm switching to opencart 1.5.6.4 and need to find a module that has the same feature. manly when you buy more items in the same category you get a bigger discount which would be fix not percentage. so my question is does anyone know of a free Dynamic Pricing & Discounts module for opencart 1.5.6.4.

There is an extension that helps you create offers for within same category or different category.
Like when you buy 2 get 1 more at fixed price or percentage from a specific category.

Extension link : Category combination offers for promotion

Also if you want to have site wise discount based on cart total, then check below extension:

Extension link : Cart total offers