Hi,
The manufacturer system only accept one single manufacturer per product.
It is not plan to handle multiple manufacturer in a short time because it will be incompatible with the current structure of the database for the manufacturer.
But HikaShop have a multi-category support for the products.
So if you want to propose an interface to list the products, you can use them.
Otherwise there is the possibility to use product custom fields and filters (thanks to HikaShop Business) ; it could be useful if you want to display the information and let the user filters the products in a listing.
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.