Set a discount based on QTY of entire shopping cart

I have a few products that are all almost exactly the same. Different colors and styles, but all the same price, weight, etc.

I want to give a discount based on the qty of the shopping cart. I was able create qty discounts from the price manager on each product, but I want them to get the discount if they order 4-14 & 15+ items total, not just for one color, but the whole cart.

Is there a way to do that?

Answered my own question. Found the Discount on Qty Add-On. Thanks

You mean this one I assume:
http://www.zen-cart.com/index.php?main_page=product_contrib_info&products_id=235

This doesn't use the price manager; it's separate. But it's the way to go if you're discounting the total purchase of multiple products; the price manager is appropriate if you're discounting the total purchase of one single product.