Help modifying a shopping cart

[Jisung]

hi, I am a newbie who is trying to create a commercial site. But i need some help to modify the cart in prestashop.

if you go to this site http://www.clearlycontacts.ca/contact-lenses/1-Day-Acuvue-Moist/prod91508.html and look at the blanks to put prescription, there are options to order two diffent prescription, right and left eyes, at the same time.

however, prestashop just allowed to order one product at a time.

Also, i want to add some discount for 4 or more boxes of contacts lenses. It works ok if its same prescription, but it doesnt work if the prescription has two differnt ones. for example, the discount applys properly when i order 4 of -2.00 contacts lenses; however, it doesnt apply when i order 2 of -2.00 and 2of -3.00 differntly while they are same product.

Please help !

[Radu]

you can try using attributes for now, however why you say prestashop can't add more than one product? it can if you write a little javascript however why don't you let 2 add to cart buttons for each eyes?

[Jisung]

hi radu!

i dont know which file i have to modify,

and can u give me a souce for this matter?

Thanks