It is best to use configuration layering to create extended configuration files that reside within your own application module, and point these files to the extended configuration files, JavaScript or CSS files contained in your custom application. Adding a new field to the end of the default fields is best done by modifying the appropriate extended properties file. New fields will be displayed after the default fields. This prevents your customizations from being overwritten if Commerce Service Center is updated, as the configuration properties are located in your Web application.

By creating an extended configuration component you can append content to the page without changing the default configurations. The extended component contains the same functionality as, and is defined directly after, the default components.