Hi,
There is no such kind of feature in HikaShop manual shipping plugin.
You can use "order custom field" (requires Business) to let customer enter values during the checkout ; but even if the customer enter something, I don't see how you can set a shipping price or bill something.
So I'm afraid that I don't understand or see what you want to perform but I suppose that it would require some custom development for a custom feature.
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.