How to automate Customer Invoice to supplier invoice

Hi,

Our client wants to automate the customer invoice to supplier invoice with out any manual interference.

For ex: If there's customer called 'A' we are invoicing for A  $1000. And then we receive money.

           Those $1000 should be created as a Supplier invoice for supplier called 'B'.

Due to high volume of such transactions our client wants to automatically create a supplier invoice once we enter a customer receipt.

Appreciate a solution for this issue.

Thanks in advance.

Sanjeewanee