I have a form and I would like to accomplish the following:

Outside public goes to link and sees first 4 fields of form and completes them.

Form goes to user inboxes.  Based on user, more fields open up which that user can then enter information into.

I'm dabbling with hiding fields, but I not only need selected users to see fields, but to also edit them - and this would be after the form is submitted. 

i.e.

Jane Doe provides me with her name, ID #, some text and a signature.  These are the only fields Jane Doe sees.  She clicks on submit and form enters process.

Form is routed to inbox for User A.  User A opens form and, based on the fact that they are User A, a couple of additional fields appear.  User A can enter text or make a choice in these fields before proceeding to the standard approve/deny option.  Form then goes to User B, who can see what User A has entered as well as the contents from the original submitter.

I know there is an approve/deny feature (I am already using that) and a comments box that is available at the step where User A would receive the form.  However, I want my User A to be able to supply more information than these 2 choices provide before the form proceeds to User B.  I don't want to rely solely on the comments box.

Is this possible?  I am somewhat familiar with CSS and forms creation, not familiar w/Java.