You can have some resetting methods in each managed bean and call each one of them on click of Submit. You should be able to access one managed bean from another. I dont know if this is a good practice, but every property that I have in a managed bean, I also have it in the reset method of the managed bean.
But do consider where the submit button should take to; will it still be showing the data present on these 7 pages?
If this is the case you are better off calling those reset methods while navigating away from these 7 pages(like back to Main Menu or some other unrelated page). As an alternate, you could also call these reset methods at the time of starting the 7 pages workflow.
Note that above methods only reset the properties in the managed bean; the managed bean itself will still be in session.
[ December 02, 2008: Message edited by: A. Dusi ]