Webform Prefill Submission

This module extends the Webform module and allows your users to create new Webform Submissions pre filled with the data from previous Webform Submissions. When your users click the "Prefill new" link from the results, they will be redirected to a brand new Webform Submission in "draft" mode, pre filled with the values from whichever submission they chose, allowing them to change whichever data may differ in the new submission and submit it.This can be specially useful in cases where your users need to fill the same Webform periodically with little to no changes.
Prefill submission has its own permissions, as users may or may not be allowed to create new prefilled forms, but not to edit existing ones, etc.

http://git.drupal.org/sandbox/Vyz/1647506.git