can user work on form and come back to it and add more

I send my clients a link to the main form are they able to work on it and come back to it later or does it need to be filled out all at once?

Hi,

You can attach an "Edit Submission" link the the autoreponder of you form:

http://www.jotform.com/help/40-How-to-Let-Users-Update-Their-Form-Submissions-at-a-Later-Date

This would give your users a link to be able to come back at a later time to update their submission. 

If this is not what you were looking for, let us know and we will be happy to assist you further.