Additional Information box?

Hi

I'm trying compile a form the the user completes, I've almost finished it
but cant find out how to put together an additional information box, the type
where you can tab into it from other parts of the form and submit any other
details the user may feel could be relevant, (I've worked out you have to
protect the doc for this to work for the rest of the form)

I'm sure there must be an option for this in the legacy tools somewhere but
cant seem to find it, thanks once again for any help.

bryan