How to cater Inter/Intra Company Payments through Oracle Payables

Hello,

How can I cater the following scenario,

There are two business units of the same legal entity. Business Unit "A" and Business Unit "B". Business unit "B" does not have any bank account and therefore all payments are made through Business Unit "A".

How can I set up so that:

1) Invoices are made in business unit "B"

2) Payment is made in business unit "B", however the bank account used is of business unit "A"

3) Inter/Intra Company lines are generated to reflect the respective units receivables and liability.

Thanks.