Hi Macropot,
I sent the files to a friend of mine and the links you provided, and she managed to get me separate files. Thank you very much for your time and guidelines!

But now, what is the best way to get the chapters put in one document? You suggested INCLUDTEXT, but will work for the following: I have almost 400 pages, and I assume I will slightly exceed 400 pages. I also have a considerable number of section breaks and tables, all of which might make it easy for the doc to corrupt or become very slow if in one document. I am using style for headings, captions for tables and so many auto cross references.

Can I use INCLUDTEXT without losing any of the above features?