Hi,
Modification you asked are not easy to do. It requires a lot of modification in the view in order to change how the process is made.
I recommend you to ask to a developer to made you this customization using an HikaShop view override.
You can also contact our team thanks to the "contact us" page in order to request a quote.
Please mentions the different pages/elements that you want to override (front-end, back-end, emails ?)
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.