update

Assets/Scripts/Manager/CustomPrefabsCollection.cs

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+using System.Collections;
+using System.Collections.Generic;
+using Sirenix.OdinInspector;
+using UnityEngine;
+
+namespace Ichni.RhythmGame
+{
+    [CreateAssetMenu(fileName = "BasePrefabsCollection", menuName = "Ichni/CustomPrefabsCollection", order = 0)]
+    public class CustomPrefabsCollection : SerializedScriptableObject
+    {
+        public string themeBundleName = "theme_bundle_name_here";
+        public Dictionary<string, GameObject> Prefabs = new Dictionary<string, GameObject>();
+        
+        public GameObject GetPrefab(string prefabName)
+        {
+            if (Prefabs.TryGetValue(prefabName, out GameObject prefab))
+            {
+                return prefab;
+            }
+            else
+            {
+                Debug.LogError($"Prefab '{prefabName}' not found in {themeBundleName} collection.");
+                return null;
+            }
+        }
+    }
+}