Menu, Game mode Array String to change settings?

I’m trying to get my game mode array to change setting. Like if game mode was selected to be hard cord mode. The level of difficulty can not be changed. If someone help me out with this? Here is my script.

using UnityEngine;
using System.Collections;
[ExecuteInEditMode]
public class NewGame : MonoBehaviour {
//Background Picture
	public Texture OptionsBG;
//Back Button Varabels
	public GameObject MMCamra;
	public GameObject OPCarmra;
	public GameObject OPCarmra2;
	public GameObject OPCarmra3;
//Save file name
	public string PlayerName = "Game Name";
//Level of Difficulty selector Drop menu
	public string[] Difficulty;
	public string selectedDifficulty = "Difficulty";
	private bool editing = false;
//System Size Drop menu
	public string[] SystemSize;
	public string selctedSystemSize = "System Size";
	private bool editing2 = false;
//resources Drop menu
	public string[] Resources;
	public string selctedResources = "Resource Availability";
	private bool editing3 = false;
//Game Mode Drop Menu
	public string[] GameMode;
	public string selctedGameMode = "Game Mode";
	private bool editing4 = false;



	private void OnGUI(){

		GUI.DrawTexture (new Rect (0, 0, Screen.width, Screen.height), OptionsBG);

		GUI.Box (new Rect (Screen.width * .01f, Screen.height * .01f, Screen.width * .98f, Screen.height * .85f),"New Game");

		PlayerName = GUI.TextField(new Rect(Screen.width * .02f, Screen.height * .04f,Screen.width*.25f,25),PlayerName,27);

		GUI.Label(new Rect(Screen.width*0.02f,Screen.height*0.075f,Screen.width*.25f,25),"Game Mode");
		if (GUI.Button (new Rect (Screen.width * .02f, Screen.height * .1f, Screen.width * .25f, 25), selctedGameMode)) {
			editing = false;editing2 =false;editing3 =false;editing4 =true;
		} 
		if (editing4)
		{
			for (int x = 0; x < GameMode.Length; x++)
			{
				if (GUI.Button(new Rect(Screen.width*.27f,(Screen.height*.1f)+(25*x) ,Screen.width*.25f,25 ), GameMode[x]))
				{
					selctedGameMode = GameMode[x];
					editing4 = false;
				}
			}
		}

		GUI.Label(new Rect(Screen.width*0.02f,Screen.height*0.145f,Screen.width*.25f,25),"Level of Difficulty");
		if (GUI.Button (new Rect (Screen.width * .02f, Screen.height * .17f, Screen.width * .25f, 25), selectedDifficulty)) {
			editing = true;editing2 =false;editing3 =false;editing4 =false;
				} 
		if (editing)
		{
			for (int x = 0; x < Difficulty.Length; x++)
			{
				if (GUI.Button(new Rect(Screen.width*.27f,(Screen.height*.17f)+(25*x) ,Screen.width*.25f,25 ), Difficulty[x]))
				{
					selectedDifficulty = Difficulty[x];
					editing = false;
				}
			}

		}
		GUI.Label(new Rect(Screen.width*0.02f,Screen.height*0.215f,Screen.width*.25f,25),"System Size");
		if (GUI.Button (new Rect (Screen.width * .02f, Screen.height * .24f, Screen.width * .25f, 25), selctedSystemSize)) {
			editing = false;editing2 =true;editing3 =false;editing4 =false;
		} 
		if (editing2)
		{
			for (int x = 0; x < SystemSize.Length; x++)
			{
				if (GUI.Button(new Rect(Screen.width*.27f,(Screen.height*.24f)+(25*x) ,Screen.width*.25f,25 ), SystemSize[x]))
				{
					selctedSystemSize = SystemSize[x];
					editing2 = false;
				}
			}
			
		}
		GUI.Label(new Rect(Screen.width*0.02f,Screen.height*0.285f,Screen.width*.25f,25),"Amount of Resources");
		if (GUI.Button (new Rect (Screen.width * .02f, Screen.height * .31f, Screen.width * .25f, 25), selctedResources)) {
			editing = false;editing2 =false;editing3 =true;editing4 =false;
		} 
		if (editing3)
		{
			for (int x = 0; x < Resources.Length; x++)
			{
				if (GUI.Button(new Rect(Screen.width*.27f,(Screen.height*.31f)+(25*x) ,Screen.width*.25f,25 ), Resources[x]))
				{
					selctedResources = Resources[x];
					editing3 = false;
				}
			}
			
		}



		if (GUI.Button (new Rect (Screen.width * .15f, Screen.height * .9f, Screen.width * .1f, 25),"Reset")) {
			PlayerName = "Game Name";
			selectedDifficulty = "Difficulty Level";editing=false;
			selctedSystemSize = "System Size";editing2=false;
			selctedResources = "Resource Availability";editing3=false;
			selctedGameMode = "Game Mode";editing4=false;
		} 

		
		if (GUI.Button (new Rect (Screen.width * .01f, Screen.height * .9f, Screen.width * .1f, 25), "Back")) {
			Debug.Log("Switching to Main Menu");
			MMCamra.gameObject.SetActive(true);
			OPCarmra.gameObject.SetActive(false);
			OPCarmra2.gameObject.SetActive(false);
			OPCarmra3.gameObject.SetActive(false);
		}	
	}
}

Here is the simple version (without any big code refactoring):

using UnityEngine;
using System.Collections;

[ExecuteInEditMode]
public class NewGame : MonoBehaviour
{
    //Background Picture
    public Texture OptionsBG;
    //Back Button Varabels
    public GameObject MMCamra;
    public GameObject OPCarmra;
    public GameObject OPCarmra2;
    public GameObject OPCarmra3;
    //Save file name
    public string PlayerName = "Game Name";
    //Level of Difficulty selector Drop menu
    public string[] Difficulty;
    public string selectedDifficulty = "Difficulty";
    private bool editing = false;
    //System Size Drop menu
    public string[] SystemSize;
    public string selctedSystemSize = "System Size";
    private bool editing2 = false;
    //resources Drop menu
    public string[] Resources;
    public string selctedResources = "Resource Availability";
    private bool editing3 = false;
    //Game Mode Drop Menu
    public string[] GameMode;
    public string selctedGameMode = "Game Mode";
    private bool editing4 = false;



    private void OnGUI()
    {

        GUI.DrawTexture(new Rect(0, 0, Screen.width, Screen.height), OptionsBG);

        GUI.Box(new Rect(Screen.width * .01f, Screen.height * .01f, Screen.width * .98f, Screen.height * .85f), "New Game");

        PlayerName = GUI.TextField(new Rect(Screen.width * .02f, Screen.height * .04f, Screen.width * .25f, 25), PlayerName, 27);

        GUI.Label(new Rect(Screen.width * 0.02f, Screen.height * 0.075f, Screen.width * .25f, 25), "Game Mode");
        if (GUI.Button(new Rect(Screen.width * .02f, Screen.height * .1f, Screen.width * .25f, 25), selctedGameMode))
        {
            editing = false; editing2 = false; editing3 = false; editing4 = true;
        }
        if (editing4)
        {
            for (int x = 0; x < GameMode.Length; x++)
            {
                if (GUI.Button(new Rect(Screen.width * .27f, (Screen.height * .1f) + (25 * x), Screen.width * .25f, 25), GameMode[x]))
                {
                    selctedGameMode = GameMode[x];
                    if (selctedGameMode == "Hardcore") // Or replace with the actual GameMode[N] value
                    {
                        selectedDifficulty = "Vary Hard"; // Or replace with the actual Difficulty[N] etc. values
                        selctedSystemSize = "Normal";
                        selctedResources = "Few";
                    }
                    editing4 = false;
                }
            }
        }

        GUI.Label(new Rect(Screen.width * 0.02f, Screen.height * 0.145f, Screen.width * .25f, 25), "Level of Difficulty");
        if (GUI.Button(new Rect(Screen.width * .02f, Screen.height * .17f, Screen.width * .25f, 25), selectedDifficulty))
        {
            if (selctedGameMode != "Hardcore") // Or replace with the actual GameMode[N] value (and the ones below)
            {
                editing = true; editing2 = false; editing3 = false; editing4 = false;
            }
        }
        if (editing)
        {
            for (int x = 0; x < Difficulty.Length; x++)
            {
                if (GUI.Button(new Rect(Screen.width * .27f, (Screen.height * .17f) + (25 * x), Screen.width * .25f, 25), Difficulty[x]))
                {
                    selectedDifficulty = Difficulty[x];
                    editing = false;
                }
            }

        }
        GUI.Label(new Rect(Screen.width * 0.02f, Screen.height * 0.215f, Screen.width * .25f, 25), "System Size");
        if (GUI.Button(new Rect(Screen.width * .02f, Screen.height * .24f, Screen.width * .25f, 25), selctedSystemSize))
        {
            if (selctedGameMode != "Hardcore")
            {
                editing = false; editing2 = true; editing3 = false; editing4 = false;
            }
        }
        if (editing2)
        {
            for (int x = 0; x < SystemSize.Length; x++)
            {
                if (GUI.Button(new Rect(Screen.width * .27f, (Screen.height * .24f) + (25 * x), Screen.width * .25f, 25), SystemSize[x]))
                {
                    selctedSystemSize = SystemSize[x];
                    editing2 = false;
                }
            }

        }
        GUI.Label(new Rect(Screen.width * 0.02f, Screen.height * 0.285f, Screen.width * .25f, 25), "Amount of Resources");
        if (GUI.Button(new Rect(Screen.width * .02f, Screen.height * .31f, Screen.width * .25f, 25), selctedResources))
        {
            if (selctedGameMode != "Hardcore")
            {
                editing = false; editing2 = false; editing3 = true; editing4 = false;
            }
        }
        if (editing3)
        {
            for (int x = 0; x < Resources.Length; x++)
            {
                if (GUI.Button(new Rect(Screen.width * .27f, (Screen.height * .31f) + (25 * x), Screen.width * .25f, 25), Resources[x]))
                {
                    selctedResources = Resources[x];
                    editing3 = false;
                }
            }

        }



        if (GUI.Button(new Rect(Screen.width * .15f, Screen.height * .9f, Screen.width * .1f, 25), "Reset"))
        {
            PlayerName = "Game Name";
            selectedDifficulty = "Difficulty Level"; editing = false;
            selctedSystemSize = "System Size"; editing2 = false;
            selctedResources = "Resource Availability"; editing3 = false;
            selctedGameMode = "Game Mode"; editing4 = false;
        }


        if (GUI.Button(new Rect(Screen.width * .01f, Screen.height * .9f, Screen.width * .1f, 25), "Back"))
        {
            Debug.Log("Switching to Main Menu");
            MMCamra.gameObject.SetActive(true);
            OPCarmra.gameObject.SetActive(false);
            OPCarmra2.gameObject.SetActive(false);
            OPCarmra3.gameObject.SetActive(false);
        }
    }
}