you create them by overloading.

Code:
void DoFoo(int FooA, int FooB, int FooC)
{
//do something badass
}

void DoFoo(int FooA, int FooB)
{
  DoFoo(FooA, FooB, MyDefault);
}

void DoFoo(int FooA)
{
  DoFoo(FooA, MyDefault);
}


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