Basic split saving and loading of scene files

Editor/ScenePartitionSO.cs

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+using System.Collections.Generic;
+using UnityEditor;
+using UnityEngine;
+
+namespace VertexColor.ScenePartition
+{
+    [CreateAssetMenu(fileName = "Scene", menuName = "Max/ScenePartitionSO")]
+    public class ScenePartitionSO : ScriptableObject
+    {
+        [field: SerializeField]
+        public SceneAsset sceneAsset { get; private set; } = null;
+        public string sceneName { get; private set; } = "";
+
+        private List<string> loadedPartitions = new List<string>();
+
+        private void OnValidate()
+        {
+            if (string.IsNullOrWhiteSpace(sceneName) && sceneAsset != null)
+            {
+                sceneName= sceneAsset.name;
+            }
+        }
+    }
+}

Editor/ScenePartitionSO.cs.meta

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Editor/ScenePartitionSOEditor.cs

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+using UnityEngine;
+using UnityEditor;
+using System.IO;
+
+namespace VertexColor.ScenePartition.Editor
+{
+    [CustomEditor(typeof(ScenePartitionSO))]
+    public class ScenePartitionSOEditor : UnityEditor.Editor
+    {
+        //SerializedProperty property;
+
+        void OnEnable()
+        {
+            //property = serializedObject.FindProperty("myProperty");
+        }
+
+        public override void OnInspectorGUI()
+        {
+            DrawDefaultInspector();
+
+            ScenePartitionSO scenePartitionSO = (target as ScenePartitionSO);
+
+            serializedObject.Update();
+            //EditorGUILayout.PropertyField(property);
+            serializedObject.ApplyModifiedProperties();
+
+            if (GUILayout.Button("Load"))
+            {
+                ScenePartitionUtils.Load(scenePartitionSO);
+            }
+
+            if (GUILayout.Button("Save"))
+            {
+                ScenePartitionUtils.Save(scenePartitionSO);
+            }
+
+            if (GUILayout.Button("Unload"))
+            {
+                ScenePartitionUtils.Unload(scenePartitionSO);
+            }
+
+            if(GUILayout.Button("Open Scene Data"))
+            {
+                EditorUtility.RevealInFinder(ScenePartitionUtils.GetDataPath(scenePartitionSO));
+            }
+        }
+    }
+}

Editor/ScenePartitionSOEditor.cs.meta

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Editor/ScenePartitionUtils.cs

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+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using UnityEditor;
+using UnityEditor.SceneManagement;
+using UnityEngine;
+using UnityEngine.SceneManagement;
+
+namespace VertexColor.ScenePartition.Editor
+{
+    public static class ScenePartitionUtils
+    {
+        public static string GetDataPath(ScenePartitionSO scenePartitionSO)
+        {
+            string dataPath = Path.Combine(Application.dataPath, $"../Data/Scenes/{scenePartitionSO.name}");
+
+            if (!Directory.Exists(dataPath))
+            {
+                Directory.CreateDirectory(dataPath);
+            }
+
+            return dataPath;
+        }
+
+        public static string GetScenePath(ScenePartitionSO scenePartitionSO)
+        {
+            string scenePath = AssetDatabase.GetAssetOrScenePath(scenePartitionSO.sceneAsset);
+
+            return scenePath;
+        }
+
+        public static void Load(ScenePartitionSO scenePartitionSO)
+        {
+            string dataPath = GetDataPath(scenePartitionSO);
+            string scenePath = GetScenePath(scenePartitionSO);
+
+            List<string> data = new List<string>();
+            List<string> files = Directory.GetFiles(dataPath).ToList();
+            files.Sort();
+
+            for (int i = 0; i < files.Count; i++)
+            {
+                data.AddRange(File.ReadAllLines(files[i]));
+            }
+
+            File.WriteAllLines(scenePath, data);
+
+            AssetDatabase.Refresh();
+        }
+
+        public static void Save(ScenePartitionSO scenePartitionSO)
+        {
+            string dataPath = GetDataPath(scenePartitionSO);
+            string scenePath = GetScenePath(scenePartitionSO);
+
+            string[] data = File.ReadAllLines(scenePath);
+
+            int lastIndex = data.Length;
+            for (int i = data.Length - 1; i >= 0; i--)
+            {
+                if (data[i].StartsWith("---")) // --- is the start of a new yaml document.
+                {
+                    int idStartIndex = data[i].IndexOf(" &") + 2; // & is the start of the object id.
+                    int idLength = data[i].Length;
+
+                    File.WriteAllLines($"{dataPath}/{scenePartitionSO.sceneName}-{data[i][idStartIndex..idLength]}.yaml", data[i..lastIndex]);
+
+                    lastIndex = i;
+                }
+            }
+
+            File.WriteAllLines($"{dataPath}/{scenePartitionSO.sceneName}.yaml", data[0..lastIndex]);
+        }
+
+        public static void Unload(ScenePartitionSO scenePartitionSO)
+        {
+            string dataPath = GetDataPath(scenePartitionSO);
+            string scenePath = GetScenePath(scenePartitionSO);
+
+            Scene scene = EditorSceneManager.OpenScene(scenePath, OpenSceneMode.Single);
+
+            GameObject[] gameObjects = scene.GetRootGameObjects();
+
+            for (int i = gameObjects.Length - 1; i >= 0; i--)
+            {
+                Object.DestroyImmediate(gameObjects[i]);
+            }
+
+            EditorSceneManager.SaveScene(scene);
+
+            AssetDatabase.Refresh();
+        }
+    }
+}

Editor/ScenePartitionUtils.cs.meta

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Editor/VertexColor.ScenePartition.Editor.asmdef

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+    "name": "VertexColor.ScenePartition.Editor",
+    "rootNamespace": "VertexColor.ScenePartition.Editor",
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+        "Editor"
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