Adding multi vendor facility to woo-commerce site.

Greetings ! We have developed a woo-commerce website you can visit at shopkato.in. Right now our workflow for posting a product is : 1. vendor sing up on our website 2. Create his own new product add quantity and put it to sell 3. Admin aprovals this product & then it goes live What changes we are looking for are : [login to view URL] step 2 to: the vendor will select a product that we maintain in the database, just add his quantity and price tag. B. right now if 2 separate vendors sell Samsung s20, 2 copies can be seen on-site, instead (after change) user can see the best price from vendors when he tries to buy the product he can select a vendor himself whoever gives the lowest price or give is able to deliver to their place (we have a shipping API) C. a few other changes might be there