Hi,
If you want to have a different look for your "partner" orders (when you pay a partner), the best will be to perform a modification in the "preload" of the corresponding order notification email and change the variable "$path" depending on the content of the "$data->order->order_type".
It allow you to create new HTML files in the media/com_hikashop/mail folder and use them when the order is a partner order.
I hope that my explanation is clear enough.
Regards,
Jerome - Obsidev.com
HikaMarket & HikaSerial developer / HikaShop core dev team.
Also helping the HikaShop support team when having some time or couldn't sleep.
By the way, do not send me private message, use the "contact us" form instead.