Thanks for clarifying! There is a way that you can show inventory for your B2B store for all your Customers!
To do so, all you have to do is leave the B2B stock fallback location for your orders blank (You might need to use the backspace button if you have already selected a location)
Additionally, ensure that the default fallback location for that customer is blank as well.
This will allow your B2B customer to view all available stock from multiple locations for your products, essentially allowing you to fulfill the order from various locations for larger B2B orders.
Hope this helps! :)