Beginners scripting, pls Help with clones deleting

Hello. im new in Unity, only 1 week learning.. And have occured a problem which is hard to find for me in google or other sources..
1. I want to have a Spawn (as prefab);
2. i want, that this Spawn would create atleast 3 different Objects (prefabs) after my commands.
And i want, that if i create a clone1, then i create clone2, the clone1 would dissapear..
3. I want to drag on terrain several same spawns, if i press on any of them, only there created clone1 would dissapear when i create clone2 or clone3 on same spawn and so on..
So far i have everything coded, just except the 3rd part.

Code (csharp):

1.  
2. var  _mouseOver : boolean = false;
3. var created : int = 0;
4. var ObjectCube : GameObject;
5. var ObjectSphere : GameObject;
6. var PlaceTaken : int = 0;
7. public var SpawningObject : int = 0;
8. function Start() {
9. gameObject.renderer.material.color = Color.blue;}
10. function OnGUI()
11. { if(!_mouseOver) return;}
12. function OnMouseOver()
13. {_mouseOver = true;}
14. function OnMouseExit()
15. { _mouseOver = false;}
16. function Update() {
17. if (_mouseOver == true  Input.GetButton("Fire1")){
18. created = 1;
19. gameObject.renderer.material.color = Color.red;}
20. if (_mouseOver == false  Input.GetButton("Fire1")){
21. created = 0;
22. gameObject.renderer.material.color = Color.blue;}
23. if (created == 1  PlaceTaken == 0  SpawningObject == 2){
24. var clone = Instantiate(ObjectCube, transform.position, transform.rotation);
25. PlaceTaken = 1;}
26. if (created == 1  PlaceTaken == 0  SpawningObject == 3){
27. var clone1 = Instantiate(ObjectSphere, transform.position, transform.rotation);
28. PlaceTaken = 1;}}
29.  

I wish to have on the end of this script a working function like that, but i dont imagine a working example..

Code (csharp):

1.  
2. if (SpawningObject == 2  Input.GetKeyDown(KeyCode.R)){  //if Cube is created, i want it to just destroy and later create a Sphere
3. Destroy(clone.gameObject);}
4. if (SpawningObject == 3  Input.GetKeyDown(KeyCode.R)){ // if Sphere created, i want it just destroy and later create a Cube
5. Destroy(clone1.gameObject);}
6.  

But its somethink more complex i think, pls send me Link's or examples of working script, where i could delete exact there created clones... i believe its possible.. some way.. thx!

 

Found out the way

I created a Global, where im keeping my Enemy count information.

And after creating every enemy, i add a number to this Global, and name my new spawned monster with that number in addition. Plus, i set my cloneA or cloneB variables to this number to remember. And when i need to destroy a clone, i set the clone number on this variable created. And it perfectly destroys Cant believe it worked so easy