Hi wilson021179 ,
Thanks for your ticket.
What you ask for can be achieved with the Ivnetory Iteration setting (globally or per product). You can read more about it in this article and how to set it up in this one.
With it, you tell ATUM Multi Inventory what to do when the first inventory in the order is depleted. Setting it to 'Show out of stock' will imply showing only the first inventory in order stock.
I hope this helps.
Best Regards,
José Andrés