Note: The field to set a Product as Tax Exempt is not visible until you turn on the Charge Sales Tax option in the cart.
|System Shipping Settings|
With Invisible Gold 3.1 and newer, you set shipping levels in the system settings page. The main option lets you add shipping later (ex: in an email), not charge shipping, use shipping tables, and use shipping tables but let products override the shipping levels if they set a value instead.
Once you turn on the shipping tables, you can set up to 5 different shipping options. For example, you can set weight values for each product and then use the shipping table to calculate the price automatically.