Scalable Asset Library

I have many Unity packages that have overlapping asset types. - What is the best way to consolidate all my assets in a way, so that I can then search for a specific type of asset. For example, I want to put all my vehicles in one location, so I don't have to go package by package looking for the right vehicle to import into my project. - What is the best way to achieve a scalable asset library, which allows you to view assets and import them effectively.

Thank you, Calixto