@saurabhj91 WC Marketplace doesn’t have any inbuild setting so that the vendor can import product. Will you please let us know how the vendors are able to add product via CSV.
Please note that as WC Marketplace is an extension of WooCommerce, hence WC Marketplace also treats the variable product as single product and only send one email to admin ( when vendor adds the product) or to vendor ( when admin assigns a product to the vendor ). In both cases, they both receive only one mail.
So, in order to assist you better, it would be helpful, if you could let us know how are the vendors adding product via CSV.
Waitting for your reply.