The light bulb quick action, Convert to COBOL Syntax, is available for some .NET types that have a corresponding predefined managed COBOL type. You can convert such types to COBOL predefined types - for example, System.UInt64 converts to binary-double unsigned.
Using COBOL predefined types ensures that your applications are platform independent and you can easily export them from Visual Studio and edit them with Enterprise Developer for Eclipse.
To convert a type:
You can choose to simplify the current occurrence of a fully qualified name or simplify all occurrences of that name in the current file (click Document) or in the current file and any copybooks displayed in the expanded copybook view in it (click Program).