SugarCRM : Address Field Added

Hi. I have created a Sugar Module (Suburbs) with a list of all the localities in Australia. I'm wanting to add this relationship to the 'Address' fields in Accounts / Contacts / Leads. Using information contained in the Suburbs modules - automatically populate other fields such as Postal Code and State. Adding the Suburb field essentially replaces the 'State' field. This is required to ensure correct addressing and provides the ability to view customers / leads / contacts by Suburb.