Use the Subpart Features Syntax window when you want to add a script statement that does one of the following to a subpart in the class that you are editing in the Script Editor:

The script statement of your choice can be pasted into the Script Editor and referenced from the Composition Editor when you are making connections.

Each pane has its own pull-down and pop-up menus for you to use to paste the code associated with the selected subpart, attribute, and action into the Script Editor.