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void setup() {
  // Attach an interrupt on digital pin 2 (assuming you're using it with a button or sensor)
  //  attachInterrupt(digitalPinToInterrupt(2), myInterruptRoutine, RISING);

  // ... other setup code ...

  // Later, you can detach the interrupt when you no longer need it
  detachInterrupt(digitalPinToInterrupt(2)); // or detachInterrupt(2);
}

void loop() {
  // ... your main loop code ...
}

void myInterruptRoutine() {
  // This function will be executed when the interrupt on pin 2 is triggered
  // and it's still attached.  After detachInterrupt(), this routine won't be called.
}