I have released a web service project with multiple customizations that are captured in the web.config.

 I am ready to release new version of the web service.  Is there a way, within my deployment project, to capture the existing customized configurations to populate the installation dialogs and thereby eliminating the need for a client admin to re-enter his  information.

In other words, if the site has already been deployed, can I read the existing web.config in order to maintain the existing settings.