Add new light rails and prefabs

Assets/Scripts/LightProbeGroupMerger.cs

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+using System.Collections.Generic;
+using UnityEditor;
+using UnityEngine;
+ 
+public static class LightProbeGroupMerger
+{
+    const string MergedLightProbeGroupName = "MergedLightProbeGroup";
+ 
+    [MenuItem("Tools/Lights/Merge Light Probe Groups")]
+    static void MergeLightProbeGroups()
+    {
+        var lightProbeGroups = GameObject.FindObjectsOfType<LightProbeGroup>();
+        if (lightProbeGroups.Length > 1)
+        {
+            // Collect light probe positions from all light probe groups in the scene.
+            var mergedLightProbePositions = new List<Vector3>();
+            foreach (var lightProbeGroup in lightProbeGroups)
+            {
+                foreach (var lightProbePosition in lightProbeGroup.probePositions)
+                {
+                    mergedLightProbePositions.Add(lightProbeGroup.transform.TransformPoint(lightProbePosition));
+                }
+            }
+ 
+            // Create a new light probe group that merges all the light probe positions.
+            var newGameObject = new GameObject(MergedLightProbeGroupName);
+            Undo.RegisterCreatedObjectUndo(newGameObject, $"Created {MergedLightProbeGroupName}");
+            var mergedLightProbeGroup = newGameObject.AddComponent<LightProbeGroup>();
+            mergedLightProbeGroup.probePositions = mergedLightProbePositions.ToArray();
+ 
+            // Destroy the old individual light probe groups.
+            foreach (var lightProbeGroup in lightProbeGroups)
+            {
+                if (lightProbeGroup != null && lightProbeGroup.gameObject != null)
+                {
+                    Undo.DestroyObjectImmediate(lightProbeGroup.gameObject);
+                }
+            }
+ 
+            Debug.Log($"Merged {mergedLightProbePositions.Count} light probes from {lightProbeGroups.Length} light probe groups into '{MergedLightProbeGroupName}'.");
+ 
+            Selection.activeObject = newGameObject;
+        }
+    }
+}

Assets/Scripts/LightProbeGroupMerger.cs.meta

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