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Found in the Web interface of ITAM as a sub navigation item under Settings in the main left sidebar.

This list page is for the definition of Hardware Replacement models. These can be defined for Computers or Devices. The layout of this page and the record details therein are very much like the Computers and Devices pages. Overall the intended use is to create preset configurations to link to hardware records as reference of their baseline or Replacement models. This can then be leveraged in the Hardware Replacement Extra.
Each Model will be in a Category for easy filtering, just like the Devices page. You can create Folders to organize models in any way you like (e.g. years or departments). And like other list pages, you can leverage powerful Filters to narrow your view of items. The Ribbon also has the typical tools to Add a new record, and choose your display Columns and Grouping criteria.
The Details you can define in a Model are pretty straight forward. Specifications will be useful in the Hardware Replacement Extra when reviewing the current and planned replacement stats of a computer. The Purchase pane of these records will also play a significant part in the use of the Extra, particularly the Cost.
Note that Computers and Devices have fields in their Purchase pane to link to both a base model as well as a replacement model. This sets up the relationships that are used in the replacement Extra.