limited use, multiple recipients

Hi community,
 
is there a way to make a form so some people can complete it then send to a second person who, in his turn, can fill the last part of the form without being able to edit the first part.
 
So, it's like:
 
Admin creates the form
Form send to User A
User A fills the form, leaving some empty fields
User A send form to User B
User B completed the missing fields but cannot edit what user A did
User B submits the form back
 
Would be great to have some insights...
 
Cheers,
Sacha