6.1. Can I attach a size or color to a product?
Interchange has product modifiers, or attributes, which can be carried around with the product. Inside an item list or the product page (flypage), the [item-options] tag will automatically place suitable widgets on an HTML form, and "remember" what should be selected. See the Interchange documentation for Item Options.
You can use the SeparateItems directive or set the mv_separate_items variable on the order form to cause ordered items to be put on separate lines in the shopping basket. (This is the default in the demo catalogs.)