Cloning package trees and their eaDocX docs

[eadocX Support]

I’m not sure I fully understand the Use Case…but here goes:
I have an eaDocX document, which documents some Packages (#1, #2, #3).
I want to create a second document, a ‘clone’ of the first, but which documents Packages #4,#5 and #6.
So I need to tell the second document about the list of packages it needs to document.
What about any Element Reports, Matrix Reports etc which the document contains?
Also, is the idea of Model View-based document, in 3.4, any use to you ?