After a form (travel expense request) is submitted, I have it forwarded

After a form (travel expense request) is submitted, I have it forwarded to an approving manager. I would like all the fields to be read-only except the one question that allows the yes no approval from the manager.

So basically in editing-after-submission can certain fields be read only?

This is a re-post of a comment on How to Let Users Update Their Form Submissions at a Later Date