Help with relationships

Hi everybody, I’m trying to understand the relationships but can’t find a specific step by step example that goes along with what I need, so maybe describing what I want to do is a way to find similar experiences, so here I go,

I need 4 categories, Academies, Teachers, Countries, and Cities. I have the last 2 ready and filled with countries and cities but I need to create a relation between those 2, so if I select as country USA, then my cities are US-related cities only, if I select Argentina, then, Argentinian cities only are displayed, I’d like to do this by using a select for both elements, one for countries and the results in another select that auto populates based in the previous selection. Then, once those 2 variables are selected I can check academies and teachers in that country and city.

Another way to go is to ask the user what they want to check, if academies or teachers, they select one, and then the country selector appears and then the city selector as described in the previous paragraph.

In the backend area, I should be able to select what do I want to add, countries or cities, teachers or academies, but if I want to add academies or teachers I need the ability to once I start filling this information select which country/city they belong.

Is this something that is possible with Pods?

Thanks guys!