Tax Override for NonPrintful products

If STW sells a product made by printful to a customer in NC, we have to add NC sales tax to the cost of the order so STW doesn't pay it out of pocket.  That system is established and in place, see our tax info in Shopify.  HOWEVER, if a person in NC orders a product from us that is not made by printful, we don't want to pay tax, and all products in this grouping fit that description.