Companies track all sorts of taxes constantly. It's no big deal with computers.
For example, in Florida there is no sales tax on groceries, prescription medicines, most services, etc. But if you go into a Publix and buy food (no tax), beer (tax), and a mixture of other things, you get a bunch of items which are taxed and a bunch which are not.
At Disney, the three main taxes they deal with are the normal sales tax (I think 6.5% in Orange County), the resort tax on rooms (11.5% I think), and there is also an extra tax on alcohol served in bars and restaurants. I'm not sure what the percentage is on that tax, but you'll see it on your check as a separate item in a restaurant.