you comment help me a lot but I am looking for a solution where My company B can ask for the products to warehouse A and warehouse A send it back using the ones from the stock. without buying it. Perhaps like a procurement rule maybe?

Yes possible, you can untick the buy rule for company A so it will check the stock instead of purchase.

Ok happy new year, a couple of things here happening. 1. I did exactly as your youtube video said but when the product arrives to the 2 warehouse I try to execute the order to pass from virtual location inter company to WH2/Existence but It gets stocks on waiting another operations and I dont know what other operations.

the other things will be, If my second warehouse want to do like a request of different products manually, what could be the correct way to do it? maybe using procurement request from each products? what would be the configurations for that kind of movement. And finally, is there a way to do a configuration of all products with out configure one by one like in your video.