Hi,
Right now, there is no such feature in HikaMarket.
But it is possible thanks to a custom plugin to create new features for HikaMarket. A plugin can add new controllers (like it is done for HikaSerial or the MangoPay plugin for example) and have their own views.
So, using such kind of plugin, you could implement a little export system to only export the vendor products for the wanted columns (or elements).
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.