> i would like to download website from
> <http://www.xyz.com/abc/def/index.html>
> i want the <http://www.xyz.com/abc/def'become> the root, 
so it won't download the other subdomain (for 
example <http://www.xyz.com/abc/ghi/> doesn't downloaded)

Options / Scan rules, enter the following filter:
-* +www.xyz.com/abc/def/*