I would like to modify my Invoice to client (Email-on-hold) amounts. E.g. I charge 10% Tax and my product cost is €598 (incl Tax) but I want to first deduct €200 then add 10% Tax to the remaining amount. If I activate taxes then obviously the 10% will come off the €598. Is there anyway I can modify the php files to achieve this? I have looked at the Customer-on-hold-order.php but cannot see where the Totals are inserted from there. Thanks if anyone could assist me.
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