How to implement desing in OOP

I have following structure

• One organization can have many environments.
• One environment can have many Applications.
• One application can have many Policis.

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I created class of each entities i.e.

• class Organization,
• class Environment,
• class Application,
• class Policy

Now I want to apply policies to Application. One policy should have one Policy class object.

Inheritance will not work, because every policy, I will have new Application, Environment, Organization object.

Can we do aggregation here? Need help on this

  1: https://i.stack.imgur.com/HYIak.png