* A consumable is a type of asset that is used up or depleted over time, such as printer cartridges, paper, or batteries1.
* Before a consumable can be consumed, it must have a model record, a model category record, and a consumable record in ServiceNow12.
* A model record defines the attributes of a consumable, such as its name, manufacturer, cost, and quantity12.
* A model category record specifies the type of consumable, such as office supplies, hardware, or software12.
* A consumable record tracks the current stock level, location, and status of a consumable12.
* A stock order record is used to request new consumables from a vendor or supplier, but it is not required before a consumable can be consumed13.
* A transfer order record is used to move consumables from one location to another, but it is not required before a consumable can be consumed14. References: 1: Consumables - Product Documentation:
Vancouver - ServiceNow 2: Create a consumable model - Product Documentation: Vancouver - ServiceNow 3: Create a stock order - Product Documentation: Vancouver - ServiceNow 4: Create a transfer order - Product Documentation: Vancouver - ServiceNow

Explanation
According to the ServiceNow Hardware Asset Management documentation, the Retired state indicates that the asset is no longer in use and is ready for disposal or reuse. The substates of the Retired state are:
Disposed: The asset has been discarded or recycled.
Donated: The asset has been given away to a charity or a non-profit organization.
Vendor Credit: The asset has been returned to the vendor for a credit or a refund.
Sold: The asset has been sold to a third party.
The substate Pending Disposal is not valid for the Retired state, as it is only available for the states In Stock and In Transit. The substate Destroyed is not valid for the Retired state, as it is only available for the state In Use. References:
ServiceNow Hardware Asset Management: Asset and CI management
ServiceNow Hardware Asset Management: Setting asset states and substates

Explanation
Consumables are hardware assets that are not tracked individually, but as a quantity of items in a stockroom, such as keyboards, mice, cables, etc.1 When a stock manager receives a new delivery of consumables, they can use the Mobile Asset Receiving feature to scan the barcode of the purchase order and receive multiple assets against it using a mobile device2 If the received consumables match another record in the stockroom based on the following fields:
Assigned to, Model, Model category, State, Stockroom, and Substate, then the data is automatically merged to create a blended quantity and cost3 This means that the system calculates the average cost per item and the total quantity of the consumables in the stockroom, and updates the existing record accordingly3 This feature helps to reduce duplicate records and simplify inventory management of consumables3 References: 1: Hardware Asset Management - ServiceNow 2: [Mobile Asset Receiving - ServiceNow] 3:
[Consumable Hardware Assets - ServiceNow]