There is a large site I'm downloading pages from.  The main
pages are divided up into sections e.g.

<http://www.mainpage.com/*.html> files have references to
<http://www.mainpage.com/section001>
<http://www.mainpage.com/section002> etc.  

Due to available time and the number of pages involved, I
want to download section001 today, and section002 tomorrow.
 The obvious solution seemed to be to download the main URL
and set an exclusion on section002 on day1, then change the
exclusion to section001 on day2.  

The problem is on day2, all references in the top-level html
files to section001 are now considered 'external' and the
formerly relative URIs used in section001 references are
chaged to absolute URLs.  All the files from section001 are
still local (since I can tell httrack not to erase), but I
no longer have any references to them.

How can I keep my relative URI's relative, even though I'm
now excluding download to pages?
Please help?