Hi @lynx ,
I think the problem you are facing is because the Narrative folders, as you suggest, are not functioning as parents of the narrative items contained within.
However, instead of trying to filter on the Narrative Folders, the easiest way of achieving what you want to see is to use either tags or relationships and then filter on these.
So, for instance, if you have a Part which contains a handful of Chapters and Scenes, and you know that these are all going to be in the Narrative Folder titled ‘Beginnings’, then you can assign a Tag in the Inspector called ‘Beginnings’ to each Part, Chapter and Scene. Then if you filter on that tag, all of the items you wish to see would appear in Narrative View.
You could always set up a new Item Type and Relationship ands use these as an alternative to tags. But tags would work just as well. If you do need help setting up new item types and corresponding relationships then I’m happy to assist. Or you can check out the help articles at help.timeline.app where Item Types and Relationships and Properties are all covered in some detail under the Advanced Settings section.
Hope this helps.