Data leveling UI suggestions

I m here looking for suggestions and design idea if someone can help please, Basically i m working on a screen that should display a lot of data defined by levels. Lets say we have a City with its data and for each city we have towns with its data and each town we have schools with each data and for each school we have lists on different categories Teachers, Students, Classes, Rules, Open times, Amenities. My issue is that we have a lot of data such city can have 100 towns and town can have 100 school and each list inside the school can have 20 entry. I was thinking to use the slides (link of the idea), but with this number of components, the screen will be overcharged. Any ideas or suggestions?