Hi, thanks for getting in touch with us.
We have a feature called Single Product Multiple Vendor. This lets same products to be sold by different vendors.
So to let multiple vendors sell the same product you need to follow the steps given below:
MultiVendorX>>Settings>>SPMV(Here you need to enable the option “Allow vendors to copy Products)
Also you can Assign a product to a particular vendor of your choice . For that I am giving a video for your reference.
https://drive.google.com/file/d/1bWAHdA9xO68aYuJCROrVLmF100IcB3aI/view
We are letting people Copy products as well as add new products to sell.
We will provide a css that will stop vendors from adding new products.