Info about export as Scene String. (-ss input)

List of corresponding value you should use for your -s "Parent" parameter:
Use "Primary01" if exporting anything connected to the game armature. (dress, hair, body, etc)
or
Use "Tools" if exporting a tool. (toy)
or
Use "RoomRoot" if exporting a room.

If exporting anything connected to the game armature(dress, hair, body, etc),
it is highly recommended to use the "Setting/Scene_String/animNamespace.txt" as your "Namespace" parameter value.