Spine does not support exporting only a part of a skeleton directly through its export script or command line interface. The export process in Spine is designed to handle entire skeletons, and there is no built-in functionality to specify a subset of a skeleton for export. However, you can manage different parts of your character by using separate animations or skins and then exporting the entire skeleton. At runtime, you can choose which parts to display or use in your game. If you need to export specific parts as separate frame sequences, you might need to manually adjust your project to isolate those parts before exporting.