Viewing only Select records at runtime

I have an important question to finish off a student project for the semester. I am trying to work with a student to create an application that allows for the dynamic selection of a Sport, a Team within that sport and to show their schedule. So far, I have the following which allows for all sports, all teams, and all schedules. But there must be a way to structure this so that I can only select one sport and one team at runtime. Any help is greatly appreciated   as the semester is ending next week.      
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