The licensing for that is the server version
The pricing for the server and cloud versions are independent of the number of users and number of businesses
If you are the only user, and use it on a limited number of computers under your control, then just putting the data file on a file server accessible from all your computers may achieve your required use flexibility.
See
Application Data: Move application data to another folder | Open a data file directly
see
and Search results for 'Raspberry Pi order:latest' - Manager Forum