Sales Tax - A Method to Identify Items that are Taxable

Only physical products are taxable in several states, including Nevada, where I live. Services and digital products are not taxable. I'd like a way to identify which products and services are taxable and to calculate sales tax only on those items, either individually or when part of a package. Currently, I believe that sales tax is calculated for everything if a tax rate is entered in the settings.

Examples:
1. A package that includes a photo session and digital photos is not taxable in Nevada.
2. A package that includes a photo session, digital photos, and physical products - only the physical products are taxable in Nevada.

Add a checkbox labeled "Taxable" for each product and service, which can be checked if the item is taxable. When the invoice is prepared, sales tax is calculated for all taxable items. I don't think this would be a difficult feature to implement: a checkbox, a variable (perhaps called taxable) for the checkbox value (true or false), and a modification to the invoice builder to calculate sales tax only on items where taxable == true.

There is a workaround:
1. Manually calculate sales tax for taxable items.
2. Add the sales tax calculated in step 1 to the package price.
3. Update the package price with the new package price.

However, this workaround is tedious, cumbersome, time-consuming, and introduces the potential for errors in sales tax calculations.