This feature was added with Update 25.
New copy methods for the incoming and internal transmittal workflows have been delivered with Update 25. To configure these methods in your system, a template document, Copy Transmittal Template, is delivered and accessible through the Desktop Client. For information on how to access the template document and load the file into the system, see Enable new features and functionality using template files.
After you load the above template, before using the copy method from an existing object, ensure that the Argument 8 for the below methods have the name of the customized version of the transmittal workflow.