Customizing the metamodel > Metamodel graphical editor > Adding a user definition chapter to a user definition type
  
Adding a user definition chapter to a user definition type
Now you can add these properties found in the User Definition Chapter, and put them in the User Definition Type.
1 In the Explorer, right-click the Definitions group, and then click the User Definition Type that you created. Double-click the definition, or right-click it, and then click Open.
2 Under the Chapters tab, click Choices. Drag the User Definition Chapters that you created into the Chapters property.
User Definition Type dialog
3 Click OK.
See also
Creating user symbol types
Metamodel graphical editor