Here is a video to show the basic function of webtocatalog.com. In the video I use a tab delimited text file to create the catalog that I created from the Amazon API. The file has the item, description, price, image url, category, sub category and manufacturer. Even though I use this file, you can use a file generated for your Amazon store, Google Product Feed, Pricegrabber, or any other tab delimited file or excel sheet with at least the above fields.