Dave
This is what I do with large pubs from which I want to make a smaller demo.
1.
Save As a new publication with BOTH a new pub title and a new imp name. Working with this file protects your original file.
2. Decide which chapters will form the basis for your demo.
Important: If any page in these chapters depends on material in another chapter, make sure you include those chapters/pages.
3. Delete the unwanted chapters/pages.
You should have the demo that you want. Test it because there's nothing worse that having your demo fail in public because of some missing object on which the demo depends.
This method works for me with the type of content/actions I include. Whether it works for you remains to me seen. My pubs never have to interact with LMS so, that effect is unknown.
HTH