> What is the correct method to add a new page? I want to 
make
> a collection of related websites (single pages). Say in
> Session A I add just one page. Whenever I start the new
> session in the same project, and replace the old URL with 
a
> new URL, the old page will be deleted, but I want to 
retain
> the old page *without* having it updated.

Add the URL in the URL list, and then choose "Continue an 
interrupted mirror". The existing files should be quickly 
rescanned, and new files downloaded.