This feature is not built in, it would require some programming. If you open the checkout viewset you need to loop thru the items in the cart and if only digital items (zero weight) are in the cart this hide the div surrounding the shipping section, make sure you remove or comment the required field validation. An alternate approach which is easier is just to change the title of the shipping section to "customer information" because their is still a possibility that the person purchasing the item has a different name and address than the billing information.

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At your service,
Dave Smith