Westpac appears to plan to manage St George in a fashion similar to that in which St George currently manages Bank of South Australia.In retail and business banking, at least, Westpac will provide common services, including banking infrastructure, technology platforms and the corporate centre.In a presentation published yesterday Westpac said St George and Westpac would have "separate management and dedicated CEOs".In institutional banking and wealth management there would be a more conventional merger of their businesses.Based on the material published yesterday, Westpac may plan to combine the business heads of retail banking and business banking once again, a job split more than two years ago.