Data types categorize the data that your application uses. The data types that come with your application have one or more data pages associated with them. Add properties to a data type to further customize it, for example, by adding contact information to a data type that represents a user of your application.
In the Dev Studio navigation panel, click Data types.
Click the data type that you want to modify.
On the Data model tab, scroll to the bottom.
To add a property, click Add field. Add as many properties as your application requires. Repeat these steps for any other data types, as necessary.
For information about data pages, see Data pages.