Several issues with Confirmation email & Invoice

-- HikaShop version -- : 2.6.0
-- Joomla version -- : 3.4.6
-- PHP version -- : 5.4.38

Hi,
I ran into a couple of issues with the confirmation email and the invoice pdf.

1. I am trying to show the Subtotal without taxes in the confirmation email. I got it to work with the coupon and shipping code, but am lost on how to do it with the subtotal.

2. Trackingnumber. I created a custom field called "trackingnummer" in the order table. I want to list that in the confirmation email. I found the following code.

$fieldsClass = hikashop::get('class.field');
$fields = $fieldsClass->getFields('frontcomp',$data,'order','');
foreach($fields as $fieldName => $oneExtraField) {
	echo "\r\n".$fieldsClass->trans($oneExtraField->field_realname).' : '.$fieldsClass->show($oneExtraField,$data->$fieldName);
}

Thanks Jerome,
1 and 2 are working correctly now.
3. I have the product code turned on in the settings.
This all works fine, but the only problem i still have is the product code is not showing up in the pdf invoice thats attached to the email.
How can i get it to show the product code in the attached pdf invoice?

Thank works great. Thank you.