>>Should i need centeralised server like WAN or every day data transfer
If the volume is quite high you will want to use a centralized server. I'm supprised you don't have one already.
>>I need to know the Table design
Since we don't know the exact information you need it will not be possible for us to help you out very much with that. You probably need more than one table.
what's the purpose of the tables? IRS tax reporting? then you need to consult an accountant. If you already have a database for that purpose maybe you can just use the information in that database instead of creating another one.
(1) general store information, such as an account number unique to each store, address, store manager's name, phone number, etc.
(2) Sales table with store account number and sales information. This could be a simple or complex as you need.
(3) Purchases. similar comments as for Sales.