[=== header ===]
<table>
[=== row ===]
<tr><td>['product']</td><td>['quantity']</td><td>$['price']</td></tr>
[=== footer ===]
</table>

##</code><code>##

print $tr->render(
  'row', { product=>$prod, quantity=>$quant, price=>$price } );

##</code><code>##

for (@groups) {
    # ... manipulate data ...
    $tr->render('group', \%group_data);

    for(@details) {
        # ... manipulate ...
        $tr->render('details', \%detail_data);
    }
}

##</code><code>##

if ($department eq 'Technology') {
    print $tr->render(
        'include_header', { header => $tr2->render('tech_dept') } );
}
else {
    print $tr->render(
        'include_header', { header => $tr2->render('default') } );
}