Assign a product to more than one vendor.

-- HikaShop version -- : 2.6.0
-- HikaMarket version -- : 1.6.7
-- Joomla version -- : 3.4.8

Hi.
I have a agent system, which branches sell products that defined by main branch.
For this I used hikamarket beside hikashop. but I realized that every product can be assigned to only one vendor.
So how can I do this? Or is there any other way?

I know that I can use hikamarket in normal way to add one product for each vendor but It's not really what I want. Because products are defined by main branch.

thanks in advance.