Hi Dave01
With ATUM Multi-Inventory is possible to hide the inventories for the users. You can do it in several ways, you can choose the most suitable for you: Don't put a regular price to the inventory so it won't be displayed in the frontend, set an expired date, or write off the inventory.
However, the possibility to deduct automatically the stock of the hidden inventory is not possible. You should do this manually, or you can always try with custom development to add this feature, but as we don't offer this service you will need to hire a developer.
Best Regards,
Andrea.