You can create and manage a construction resource hierarchy in the Available construction resources browser within the Constraints window of an IWP. You can create a category of a construction resource at a top-level category, and then create resources under that category as part of the hierarchy structure.
For example, you can create a construction resource at the top-level category of Vehicles. You can create resources for multiple types of vehicles under the Vehicles category.
You can have multiple top-level categories, and multiple levels of resources under the top-level category. Using the Vehicles example, you can create and manage multiple types of bulldozers under the Bulldozer category. All resources can be managed, named, and categorized according to company specific needs.