Bank Account Transfer - Setups and Purposes

Greetings Folks,

We are in the process of implementing Cash Management at our organization. We would like to know the setups required for performing bank transfers in PeopleSoft Cash Management 9.1.

We foresee the following kind of transfers being performed in the system:

1. Transfer of funds from One internal BU to another internal BU

2. Transfer of funds between Internal BU bank accounts

We also question on the concept on Internal Banking organization (Treasury Counterparty). Is this an essential setup for the Internal Bank accounts for Bank Transfer? Does Treasury counterparty definition refer to the Treasury depts within the enterprise who hold cash outside bank accounts (physical lockers etc)? Please advise.