InfoPath Dev

So can I choose a section and make the signature apply to just that section and lock everything within that section, but keep everything else editable?

Hi guys, I'm a graphic designer, new to InfoPath and getting a problem. Hope you can help! I'm adapting a Travel Form which needs to be signed by the APPLICANT, then sent to their LINE MANAGER, signed by them, then sent to a TRAVEL OFFICE. The TRAVEL OFFICE need to receive an editable form so that they can change any details they wish. ...