Duplicating an entire project?

Hi there,

I have duplicated all of the files and the folder structure in an ID CS4 project that contains 40 chapters organized under a book file. I renamed the parent folder to indicate a new version.

When I open the book file in the duplicate folder structure and open one of the chapters, ID opens the chapter file from the original folder.

How can I edit my book file to point to the newly duplicated files in the new folder structure?

I haven't found a discussion on this subject nor does my CS4 Bible seem to mention this. Am I trying to do something that shouldn't be done at all?

Thanks,

Peter H.