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

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

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

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