Referencing GameObjects in an Editor Script

I'm currently writing a script that creates a menu with one sub-item and that, when that sub item is clicked, will cause a few items in the hierarchy to become deactivated. The only issue I'm having is that I don't know if it is possible to reference GameObjects from an editor script, because I would have to attach the script to something to be able to use the drag-on-drop method. First of all, is it even possible to reference GameObjects from the hierarchy in an editor script? Secondly, if it is possible, how would I go about doing so?

Here's what I have so far:

Code (CSharp):

1. using System.Collections;
2. using System.Collections.Generic;
3. using UnityEngine;
4. using UnityEditor;
5.  
6. public class UIChangePage {
7.  
8.     [MenuItem("Tools/UI Change/Go to audio")]
9.     private static void ChangeToAudio()
10.     {
11.         //Haven't written it's functionality yet
12.     }
13.  
14. }

 

You could create a Game Object variable and use the Editor OnGUI to expose it and allow the drag and drop functionality within the editor window. Or if you know the object and it wont change then you can just do a Resources.Load