Hello,
I think you have to build a vendor funtion in viart. it help more seller can sell product on 1 store (e-sore)
It will help Viart is the best one for webmaster.
Thank you
Andy

Hi,
 
We've added the merchant module into our 2.8 release so different
merchants can sell their goods in one store and get their commissions for every sale. You can download our free version at http://www.viart.com/Free_Evaluation_Download
 
Regards,
ViArt Support Team