You want to create a grouping of all the assets under a specific category that...

To create a grouping of assets under a specific category from various locations across the DAM, use Smart Collections:

Create a Smart Collection:

Define criteria for the Smart Collection based on metadata, tags, or other properties.

AEM will dynamically group assets that match the criteria, regardless of their physical location in the DAM.

Access and Manage the Collection:

Use the Smart Collection to easily access and manage assets that fit the specified criteria, simplifying asset organization and retrieval.

References:

AEM documentation on Smart Collections and their configuration.

Best practices for using Smart Collections to manage assets effectively.