Methods to redo book

[Theresa de Valence]

Okay,

I have copied my book to oldbook and copied book files to oldfiles. In 
one file, I have cleaned up master paragraph and charater catalogs 
(deleted excess) and fiddled with master pages to make them perfect.

Now I'm ready to create a new book, but there are hundreds of 
cross-references going between book files.

In what order should I do things so that I do not have to redo all the 
cross references?

Thanks,
Theresa