Putting headings between content fields
Here is an example of putting heading (fieldset) on a comment form that I found a while back: click here.

Basically you need to do a hook_form_alter().

Start by creating a field set:

fucntion HOOK_form_FORM_ID_alter() {

$form['project_report_information'] = array(
    '#type' =&gt; 'fieldset',
    '#title' =&gt; t('Project Report Information'),
    '#collapsible' =&gt; FALSE,
  );


Next, add your fields to the field set and remove the field outside the fieldset:

$form['project_report_information']['subject'] = $form['your_field'];  //add to field set
unset($form['your_field']);                                            //remove field outside
$form['project_report_information']['your_field']['#weight'] = -10;    //of fieldset


Now repeat this for all fields and fieldsets you want.

Look over the link for a more detailed example of someone doing this. What you want is about half way down the page.