Develop > Controller layer > Management Center Web application > Customize the Management Center Web application > Extend existing objects
Add data to an existing Management Center object
Use the UserData element to add data to an existing Management Center object.
The Management Center Web application does not require any changes for this type of customization.
To add data to a Management Center object, for example information from a custom field that holds a customer's shoe size, use the UserData element in the request and response BODs. If this new data must be displayed to the user, make changes to the Management Center. When a custom property name is prefixed with xattr_, the UserData in the Noun will automatically be handled by the Management Center Web application and returned to the Management Center client. For information on adding custom data to the Management Center user interface, see Overview of customizing Management Center.
Related reference
Retrive Management Center objects by transforming Nouns into XML