Hi all, I am new to the software and the forum. I started to build an erp by breaking down my previous excel spreadsheet record into access tables. It is until recently I found the built-in sample call "Northwind" in Access template. I found an interesting feature of the template which the orders, inventory and invoices and linked together using the same set of data, while in my own database, the PO, inventory, invoice, and ledgers are stored seperately. It seems like a VB or macro coding thing, I am just wondering if there is any tutorial or guide how to realise this function?