Can we create multiple sessions?

Is it easy to create a multiple session form where our customer can start the Jot form, save it and come back to it later?

Yes, it's possible as long as a different value is used for each session, please check this guide that will help you with that: https://www.jotform.com/help/97-How-to-Save-Forms-and-Continue-Later 

If you have more  questions, please let us know.