Good Luck akila, I have not found a current one since QBO's latest restructuring.
That said, if you use the "Quickbooks Online" App from Power BI Online, and then connect to that data source from Power BI Desktop, it will automatically link the tables for you....MUCH easier than linking them yourself.
That said, since QBO's issues last week, my Power BI QBO App has not worked.... one step forward, two steps back.