diff --git a/src/controller/utils/sublevel.js b/src/controller/utils/sublevel.js
new file mode 100644
index 0000000..9fcca0b
--- /dev/null
+++ b/src/controller/utils/sublevel.js
@@ -0,0 +1,30 @@
+const SubLevel = require("../../models/Sublevel");
+const Level = require("../../models/Level");
+
+// exports.moveSublevel = async (sub_level_id, under_sub_or_level_id, isMainLevel) => {
+  
+// };
+
+exports.deleteSubLevelTreeFromRoot = async (root_sub_level_id) => {
+  let sub_level_ids = [];
+  let temp_sub_level_ids = [root_sub_level_id];
+
+  while (temp_sub_level_ids.length > 0) {
+    const level_sub_level_data = await SubLevel.find({
+      _id: temp_sub_level_ids,
+    });
+
+    sub_level_ids = [...sub_level_ids, ...temp_sub_level_ids];
+    temp_sub_level_ids = [];
+
+    level_sub_level_data.forEach((sub_level_data) => {
+      sub_level_data.sub_levels.forEach((sub_level) => {
+        temp_sub_level_ids.push(sub_level.sub_level_id.toString());
+      });
+    });
+  }
+
+  await SubLevel.deleteMany({ _id: sub_level_ids });
+  console.log("Deleting sub-level tree", { sub_level_ids });
+  return sub_level_ids;
+};
diff --git a/src/models/Sublevel.js b/src/models/Sublevel.js
index 1334ae6..465de94 100644
--- a/src/models/Sublevel.js
+++ b/src/models/Sublevel.js
@@ -67,6 +67,12 @@ const schema = new mongoose.Schema(
   }
 );
 
+schema.pre("save", function (next) {
+  // const sublevel = this;
+  // // write validation here?
+  next();
+});
+
 const SubLevel = mongoose.model("SubLevel", schema);
 
 module.exports = SubLevel;