How to import webform fields on server?
Webform Import



  Allows delimited data files to be imported as submission (results)
  into webforms.
  
  This is useful for importing submissions from other systems in to
  Webform. Can also be used to Edit submissions via Export / Import as
  long as the CSV has the SID column filled.



Webform Share 



  This is a helper module to prepopulate newly created webforms and to
  export / import webforms between sites.


I think Webform Share module definitely solve your issue.