The cart 'tables' are made from different templates, including Act_ShoppingCart.html and Act_ShoppingCartXML.html, amongst others. I'm not exactly sure which part of the cart/checkout pages you are refering to.
By the way, a lot of the answers for your questions will have already been ansered on this forum, and you'll probably find a solution quicker by searching. You seem to have quite a few questions...have you looked at the Actinic Help and the Advanced User Guide? The Help section will tell you where to find templates etc, and will give you a better grasp of how everything fits together.
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