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In order to import mass products, you need to enable “import export” option.
Go to WCMp settings and navigate to “Capabilities” tab and scroll down to “Vendor Import Capability” and “Vendor Export Capability” (see screenshot- https://prnt.sc/22yegw6 ) and enable these option.
Once enabled go to Vendor dashboard and in All Product page you’ll find the option “Import” and “Export” (see screenshot- https://prnt.sc/22yf24z )
For further information refer to this link- https://multivendorx.com/knowledgebase/wcmp-vendor-product-import-export/