title: add custom data with quote item magento
body: <p>I need a custom field in cart in with I can display uploaded file link. I am uploading file at product view page and handling this in observer. although I have change product custom price and quantity in observer and it working fine. Now further I want to show uploaded file link with each item in cart and want this link in order also.</p>
  
  <p>I am a bigginger and not sure about flow that how would I achieve this. Can any one help. Thanks</p>