I suggest you go to the App Stores (There's several to serve the various devices.) and put "Liquor Store Management" in the App Stores' search. You'll probably find some general store management apps that will be applicable to a variety of businesses, including liquor stores.
Good luck with your search!
(Beware of Q&A spam. Avoid spammers who may post links with malware attached. Just go directly on your own search, and keep your computer safe.)