Find the following code in both edit_orders.php and edit_orders_ajax.php:
for ($i=0, $n=sizeof($order->totals); $i<$n; $i++) {
$email_order .= strip_tags($order->totals[$i]['title']) . ' ' . strip_tags($order->totals[$i]['text']) . "\n";
}
and edit it to make it exclude any undesired elements; I recommend using the ot_class value of the component to do this. For instance if you wanted to exclude the the subtotal you would change it to
for ($i=0, $n=sizeof($order->totals); $i<$n; $i++) {
if (strstr($order->totals[$i]['class'], 'ot_subtotal')) continue;
$email_order .= strip_tags($order->totals[$i]['title']) . ' ' . strip_tags($order->totals[$i]['text']) . "\n";
}
You can find the class value of each component stored in the orders_total table.