Hi
When you submit your first page, you can set the value you want in the 3rd page to the form if you are using the same form for the 3rd page. If your form is in request scope, when you come from second page , make sure that its available to pass to 3rd page.For this when you submit your 2nd page, you need to check whether the value is available or not , if yes, set back to the form.
This is my idea.