How do I hold an object within one of my spheres, to where I can click the sphere and activate the object?

What I have right now is a primary sphere called the IncomeSphere, and on the OnMouseDown() function of that IncomeSphere there are 4 identical spheres that are instantiated called ActionSpheres. Within the OnMouseOver() of both the IncomeSphere and the ActionSpheres they fade in/out identifying which one is selected. On MouseUp() the ActionSpheres are destroyed. I want there to be 4 individual items within each of the ActionSpheres when they instantiate.

There are 100 gameboard like plate objects that are instantiated at the beginning of the level in the form of a 10x10 field (They have the same fade in/out highlight function). Overall I want an object from one of those 4 ActionSpheres to be activated and instantiate in the OnMouseUp() function of those plates. using UnityEngine; using System.Collections; using System.Collections.Generic;

 using UnityEngine;
 using System.Collections;
 using System.Collections.Generic;
 
 public class IncomeSphere : MonoBehaviour {
     //Constants for location
     public const float _offSetY = 58.0f;
     public const float _offSetZ = 166.0f;
     public const int _primarySphere = 296;
     
     //Constant for the slots unlocked
     public const int _slotsAvailable = 4;
     
     //Sets the Actoin Sphere prefab
     public GameObject actionSphere;
     
     //Creates three arrays to instantiate the Action Spheres
         //int[] _aSlot (actionSlot) to adjust the PrimarySphere(X) value
         //Vector3[] _aSpherePos (actionSpherePosition) to reapply the vectors
         //GameObject[] _aSphere (actionSphere) to hold the instantiated sphere
     private GameObject[] _aSphere = new GameObject[_slotsAvailable];
     private Vector3[] _aSpherePos = new Vector3[_slotsAvailable];
     private int[] _aSlot = new int[_slotsAvailable];
     
     
     
     
     
     //Sets the transparency state of the Action Spheres
     private bool alphaState = false;
     
     // Use this for initialization
     void Start() {
         //Recalculates the vectors of each Action Sphere
         for (int cnt = 0; cnt < _slotsAvailable; cnt++) {
             _aSlot[cnt] = _primarySphere + (cnt + 1);
             _aSpherePos[cnt] = new Vector3(_aSlot[cnt], _offSetY, _offSetZ);
             //Debug.Log(_aSpherePos[cnt] + " is the position for slot " + cnt);
         }
         
         renderer.material.color = new Color(0, .4f, .4f, .14f);
         //Debug.Log ("Color is now " + renderer.material.color);
     }
     
     // Update is called once per frame
     void Update (){
         
     }
     
     void OnMouseOver() {        
         #region Fade In
         //If the alpha's state is set to false and rendered below a float of 0.84 
         if (alphaState == false) {
             if (renderer.material.color.a < .84f) {
                 //Then increase the alpha by framerate * 2 and print progress
                 renderer.material.color += new Color(0, 0, 0, Time.deltaTime  * 2);
             //Unless the alpha is rendered at a float of 0.84
             } else {
                 //Then set the alpha's state to true
                 alphaState = true;
             }
         }
         #endregion
         
         #region Fade Out
         //If the alpha's state is set to false and is rendered above a float of 0.14
         if (alphaState == true) {
             if (renderer.material.color.a > .14f) {
                 //Then decrease the alpha by framerate * 2 and print progress
                 renderer.material.color -= new Color(0, 0, 0, Time.deltaTime * 2);
             //Unless the alpha is rendered at a float of 0.14
             } else {
                 //Then set the alpha's state to false
                 alphaState = false;
             }
         }
         #endregion
     }
     
     void OnMouseDown() {
         #region Creates the Action Spheres
         //Assigns space for Action Spheres
         
         //Creates the Action Spheres
         for(int cnt = 0; cnt < _slotsAvailable; cnt++) {
             Debug.Log(_aSpherePos[cnt] + " is the position for slot " + (cnt + 1));
             _aSphere[cnt] = Instantiate(actionSphere, _aSpherePos[cnt], Quaternion.identity)as GameObject;
         }
         #endregion
     }
     
     void OnMouseUp() {
         //Creates a sphere for an action to be set
         for (int cnt = 0; cnt < _slotsAvailable; cnt++) {
             Debug.Log("Slot " + (cnt + 1) + " has been destroyed");
             Destroy(_aSphere[cnt]);
         }
     }
     
     //If the mouse exits the game object
     void OnMouseExit() {
         //Then revert the rendering to it's original float
         renderer.material.color = new Color(0, .4f, .4f, .14f);
         Debug.Log ("Color reset to " + renderer.material.color);
     }
 }