Quote Originally Posted by ultimate_zc View Post
includes\languages\english\extra_definitions\YOUR_TEMPLATE\cart_upsell_defines.php
That worked perfectly. Thank you for the help!

I am having another problem, though. Now the upsell box that used to appear on the product display pages is gone. Also, on the checkout page, random products are displayed in the upsell box, none of which are linked to any of the products in the cart. Do you know what could be causing this?