How to sync two pos menu Data

I would like to ask
I have one POS for Cashier and Other is for Sever
I like to make cashier pos like server
I want to link this two pos database.

Here
Cashier POS I change Menu price so in Server POS Menu Price also Automatic change.
I would Like To make two pos Sync

What can I need Only I can do with LAN or I have to used Cloud Service.

please my question is like so bad sorry it.
please answer for me the best way how to find it .

look at this post from emre SambaPOS Database Configuration. also make sure your system only runs from one database

As said, use SQL express and connect both terminals to same database, it’s not a case of sync it’s a case of both being on the same setup.