I want to save a webform as draft for logged in user. I read somewhere that this a default feature but not able to find out. I could not find this option "Allow users to save a draft" in the form settings(Using Drupal7 and webform 3.13). Please suggest.
There is indeed a "Save as Draft" button in webforms. Check the permissions with "allow users to save draft" in the permission page.
There has been an issue reported here with the same problem as yours.