Question4_practical.cs

using UnityEngine;

public class Question4_practical : ScriptableObject
{
    public string name;
    public int hp;
}

Question4Editor_practical.cs

using UnityEditor;
using UnityEngine;

[CustomEditor(typeof(Question4_practical))]
public class Question4Editor_practical : Editor
{
    [MenuItem("Assets/CreateAsset")]
    static void Create()
    {
        Question4_practical question4Practical = CreateInstance<Question4_practical>();
        AssetDatabase.CreateAsset(question4Practical, "Assets/Question4_practical/Question4_practical.asset");
        AssetDatabase.SaveAssets();
    }

    public override Texture2D RenderStaticPreview(string assetPath, Object[] subAssets, int width, int height)
    {
        return (Texture2D)AssetDatabase.LoadAssetAtPath("Assets/Question4_practical/logo.png", typeof(Texture2D));
    }
}