If I understand what you want to do is to make a copy of the book and then in the copy make changes in some of the charts, etc. so the new book is tailored to a sibling of the person in the original book.
I don't think you can do this if there is I have never found it.
This is something like I would like to do in a book. I use extensive text items to describe assumption, problems, or stories about families in my books.
When I develop a book for a subfamily in the original book I would like to be able to use these text items in the new book without recreating the text item. i.e. if I write a Text Item A about a name change for a subfamily in Book A, I would like to use Text Item A in Book B. I would then like to update Text Item A and have the changes appear in Book A and Book B