Drop down with sizes

hey, I'm trying to find out how to make script that performs this drop down menu, does anyone know how to make this menu?

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I need it for this script which will allow the user(developer) to select what lights and how many (why I need that drop down) to turn off which then plays a SFX to simulate say a power outage or something. heres the script.

 var sound: AudioClip;
 var action: boolean;
 var done: boolean;
 
 function Start(){ 
  action = false; 
 }
 
 
 function OnTriggerEnter( other : Collider ) {
    if(other.tag == ("Player")){
      action = true;   
    }
 }
 
 
 function Update(){
  if(!done){
  if(action){
   light.enabled = !light.enabled;
   audio.PlayOneShot(sound);
   done=true;
   }
  }
 }
 
 
 @script RequireComponent(AudioSource)