Displaying warehouses in the "Inventory List" view

Summary:

Requirement:

The organizational tree consists of a main bucket and then secondary buckets corresponding to contracting companies.
Each contracting company has a warehouse bucket so resources can use their assigned inventory.

Activities are created in the main bucket and then routing assigns them to the corresponding resources.

"Resource Preferences" are configured for each activity, and all warehouses are added because the activity can be performed by any technician from any contracting company since they share work areas.

What type of configuration must be made so that resources only view the warehouse bucket of their contracting company?

Content (please ensure you mask any confidential information):