What you are really doing by creating the document structure is saying that "level 2 is a child of level 1". NOT "event type A is a child of event type B."
Level 1 has the event types: Story, Characters, Ideas
In Level 2 you could create the following event types Plot Points, Character Traits and Details.
Now any events you create in Level 2 that are children of the Level 1 event type Story, you would make Plot Points. Children of Characters you would make Character Traits, the same with the Ideas and Details event types.
Tag: StoryView, Outine 4D