i need to point all files in a subdomain to a different subdomain, but I *do not* want to redirect them, for intance

htp://abc.domain.com/file1.php
should really be:
htp://www.domain.com/subd/abc/file1.php

htp://abc.domain.com/file2.php
should really be:
htp://www.domain.com/subd/abc/file2.php

etc etc...
is this possible, and if so can i see an example? If it makes things easier i can write a unique htaccess file for every subdomain, I don't need it to be completly generic