Configs and Descs

Config.cs

using System.Collections.Generic;
using UnityEngine;

public abstract class Config<T> : ScriptableObject where T : Desc
{
    [SerializeField] protected List<T> m_Descs = new List<T>();
    public List<T> Descs { get { return m_Descs; } }

    public virtual T FindByUuid(string a_Uuid)
    {
        foreach (var desc in m_Descs)
        {
            if (desc.DescId.uuid == a_Uuid)
            {
                return desc;
            }
        }

        return null;
    }
}

Desc.cs

using UnityEngine;

public abstract class Desc : ScriptableObject
{
    [SerializeField] protected Uuid m_DescId = null;
    public Uuid DescId { get { return m_DescId; } }

    #if UNITY_EDITOR
    public void GenerateNewUuid()
    {
        m_DescId = Uuid.Generate();
    }
    #endif
}

PropConfig.cs

using UnityEngine;

[CreateAssetMenu()]
public class PropConfig : Config<PropDesc>
{
}

PropDesc.cs

using UnityEngine;

[CreateAssetMenu()]
public class PropDesc : Desc
{
    public Prop m_PropPrefab;
}

Uuid.cs

[System.Serializable]
public class Uuid
{
    public string uuid;

    public static Uuid Generate()
    {
        Uuid newUuid = new Uuid {uuid = System.Guid.NewGuid().ToString()};
        return newUuid;
    }
}

UuidDrawer.cs

using System;
using UnityEditor;
using UnityEngine;

[CustomPropertyDrawer(typeof(Uuid))]
public class UuidDrawer : PropertyDrawer
{
    public override void OnGUI(Rect a_Position, SerializedProperty a_Property, GUIContent a_Label)
    {
        EditorGUI.BeginProperty(a_Position, a_Label, a_Property);

        a_Position = EditorGUI.PrefixLabel(a_Position, GUIUtility.GetControlID(FocusType.Passive), a_Label);

        int indent = EditorGUI.indentLevel;
        EditorGUI.indentLevel = 0;

        const int uuidButtonWidth = 80;
        Rect uuidRect = new Rect(a_Position.x, a_Position.y, a_Position.width - uuidButtonWidth, a_Position.height);
        Rect newUuidButtonRect =
            new Rect(a_Position.x + uuidRect.width, a_Position.y, uuidButtonWidth, a_Position.height);

        SerializedProperty uuidProperty = a_Property.FindPropertyRelative("uuid");
        EditorGUI.SelectableLabel(uuidRect, uuidProperty.stringValue);
        if (GUI.Button(newUuidButtonRect, "New Uuid"))
        {
            if (EditorUtility.DisplayDialog("Generate new UUID?",
                "Generating a new UUID will break any data using the current uuid", "Yes", "Cancel"))
            {
                uuidProperty.stringValue = Guid.NewGuid().ToString();
            }
        }

        EditorGUI.indentLevel = indent;

        EditorGUI.EndProperty();
    }
}