Customized Cart WooCommerce

Hello All..

Currently i’m running a Banner design site with woocommerce with fixed package for customers but i want to modify the whole process with woocommerce.

I want customers to add banner sizes as per their choice and place order. The price will vary on the quantity of the banners. More banner less price. Is there any plugin or any other way from which i can achieve this. If the suggested plugin is paid no problem with that.

Thanks in advance