Pre-populate forms in formbuilder

[goallblacks]

Hi
Anyone know if it is possible to pre-populate forms in form builder. This would allow the following 2 step process to work.

step 1 - user enters data in form, (the form uses -computed fields to generate a total.)
step 2 - user submits form and the fields are computed. The user doesn't like the computed total and wants to change the data in step 1 for a new total

At the moment I know of no way to re-display step 1 with the users existing data filled in. The back button displays a new empty form.

Any suggestions would be appreciated.

thanks