Customizing the metamodel : Metamodel graphical editor : Creating user definition properties
  
Creating user definition properties
User Definition Properties are used to further define your User Definition Types. For example, if you have a User Definition Type called Book, you may want to define the different attributes a book can have, such as a Name, ISBN#, Author, Year of Publishing, Borrowed Date and who it was borrowed by. In this instance you would create these as User Definition Properties.
To create a User Definition Property
1 From the Explorer, right-click the Definitions group and select New Definition or select Dictionary > New Definition.
2 Select User Definition Property and name it. The example below uses “Name” to indicate the Name of the book.
3 Under the User Definition Type property, select the Choices button. Select and drag in the User Definition Type, such as Book.
4 The default Edit Type property is set to Text. Leave this as Text because this is where the Name of the book would reside.
5 Select OK to close the dialog.
See also
Creating user definition chapters