Hi,
I'm sorry but I don't understand your message.
Here some points :
1/ The other topic you're talking about is that exact topic ; so we are in a loop.
2/ Yes the order notification email can display the order custom fields but I don't see the link with your original question.
3/ Like Nicolas wrote, you need a custom plugin to perform the action you want, so yes, some PHP development is required.
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.