Hi,
In HikaMarket, the vendors can't copy products in the front-end.
There is a plugin which allow to duplicate products when a vendor account is created ; it is a plugin used for providing some kind of "starter product package" when new vendors.
Otherwise, there is the "vendor" characteristic which allow vendors to create their own variant for the product. When displaying the product page, they will see a "+" button or an edit button depending if they have already a variant or not for that product.
But these products are not displayed in the vendor product listing ; mostly because we can't be sure that they could see them in their categories.
I have already a task in the TODO list in order to display these special products in a dedicated page (accessible thanks to a toolbar button when seeing the vendor product listing).
For the product duplication ; it is something which has been already asked but I do not have full specifications yet.
We can't authorize vendor to duplicate any product and I was more thinking about an improvement of the "product template" system where the vendor could choose a product template when creating a new product (if they are several available product templates).
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.