Adding additional product attributes to display in Interspire shopping cart

To add additional product attributes in product details page of Interspire shopping cart we need to add an inteface in admin section to enter those details. I tried the following:

1. Admin Section: code changes
1. Open admin/templates/product_form.tpl
2. Add additional fields attribute in html format as required.
3. In admin/includes/classes/class.product.php, include the post data for inserting into database and add the fields in database as well.
4. Search for AddProductStep2
5. Add entry under lib/entities/entity.product.php

Hope this will work for you.