In the review module you can review different things, and others can comment on the review.

If you still want to have an additional reviews section the easiest way would be to copy the entire review folder, name it review2 or whatever you want. Then ftp it to your sites modules section. Go into admin/modules you will see reviews and reviews2, click edit, give it a custom name, save it and that name will show up in your modules section. Do the same thing for the other one.