Customizing the metamodel > Keywords for USRPROPS > HIDE DEFINITION
  
HIDE DEFINITION
The HIDE DEFINITION keyword removes the referenced definition type from the New Definition and Open Definition dialogs.
Take care when hiding definitions, especially if they are used by symbols that you have made active by choices in the Property Configuration dialog (Tools, Customize Method Support). You might find yourself in a situation where you are drawing symbols with no underlying definitions.
Syntax
HIDE DEFINITION definition_name
Example
HIDE DEFINITION "SQL Server Table"
See also
Keywords for USRPROPS