You can specify a starting number for your page numbers.
Place the insertion point in the footer, or in the header,
depending on where your page numbers reside, and click the
Format page number button in the Header/Footer toolbar.
Specify the desired value. This must be done manually for
each document (except, of course, for the first document
in a sequence).

Another option is to take a look at the thread
titled "Page numbering of subdocuments" at:

http://www.google.com/groups?hl=en&lr=&ie=UTF-8&oe=UTF-
8&threadm=VA.000008ca.00c6bf65%
40default&rnum=3&prev=/groups%3Fas_q%3Dpage%2520numbering%
2520includetext%26ie%3DUTF-8%26oe%3DUTF-8%26lr%3D%26hl%3Den

(Note that the above link is broken as a result of text
wrap. Make sure you copy the entire link, line by line,
into your browser's address window! If you don't want to
copy the link, simply go to www.google.com and use the  
search feature.)

Note that the second approach means creating a calculated
page number, which will not be reflected in a table of
contents field.

Hope this helps...

Stefan Blom