Products that are being sold with the cart in single order mode can also have their own customized shopping cart look and feel. Changing the Product Custom Markup is identical to Modifying the Author's Main Custom Markup.
Be sure to upload all graphics using steps under Upload Graphics.
Navigate to the product detail page from the Authors menu by selecting Products, List. Click the product name to get to the details page.
Click the Edit link next to HTML Customized Pages.
Starting with Number 3, follow the steps in Modifying Custom Markup.
To view your ordering page the way customers will see it, go to one the product's order form. Note that if you are linking directly into the cart, you will need to add Single=true to the querystring to make the cart work in single order mode, for example https://secure.softwarekey.com/solo/products/b1_cart.asp?action=add&T=1076&Single=true Product custom html does not work in standard cart mode.
As soon as you change the customized pages, they will be live.