I need to merge three different types of documents into one. The first
document is set up with chapter numbering, the second is set up with appendix
numbering, and the third is numbered for foldouts. When I insert them
together they turn into a book that consists of either all chapters or all
appendixes. I believe this is because of the Heading 1 style formatting. Is
there a way to merge the three documents into one document but have all three
of the documents keep their original formatting?  
I have tried section breaks, making sure the headings and footers are not
‘same as previous section’ but that didn’t work.

When I create separate Heading 1 styles; one for chapters, one for
appendixes and one for foldouts the document bodies become corrected, however
the page numbers remain in the chapter formatting; 1-1, 1-2,
1-3,….
I need the Appendix section to have its own unique page numbering: A-1, A-2,
A-3…..
And the foldouts: FF-1/(FF-2 Blank), FF-3/(FF-4 Blank), FF-5/(FF-6 Blank)….

If you have any suggestions I would greatly appreciate them. Thank you.