Check out example codes for "initialize enum with another enum c#". It will help you in understanding the concepts better.

Code Example 1

public enum MasterEnumAnimal {
   Dog       = 1,
   Cat       = 2,
   Bird      = 3,
   Alligator = 4,
   Camel     = 5
  }

// Subset
public enum Pet {
   Dog  = MasterEnumAnimal.Dog,
   Cat  = MasterEnumAnimal.Cat,
   Bird = MasterEnumAnimal.Bird
}

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