diff --git a/sub_project/models/sub_project.py b/sub_project/models/sub_project.py
index 81a8e68..18b8c91 100755
--- a/sub_project/models/sub_project.py
+++ b/sub_project/models/sub_project.py
@@ -10,22 +10,57 @@ class SubProject(models.Model):
                                    domain="[('is_sub_project', '=', True),('parent_project', '=', False)]", string='Sub Project')
     parent_project = fields.Many2one('project.project', domain="[('is_sub_project', '=', False)]", string='Parent Project')
 
-    @api.onchange('parent_project', 'sub_project')
-    def onchange_parent_project_sub_project(self):
-        user_list = []
-        if self.parent_project.sub_project:
-            user_list = self.parent_project.sub_project.ids
-            user_list.append(self._origin.id)
-            self.parent_project.sub_project = user_list
-        if self.sub_project:
-            for rec in self.sub_project:
-                #print('AAAAAAAAAAA', rec, rec._origin.id)
-                sub_project = self.env['project.project'].search([('id', '=', rec._origin.id)], limit=1)
-                #print('BBBBBBBBBBB', sub_project, self._origin.id)
-                sub_project.write({'parent_project': self._origin.id})
+    # @api.onchange('parent_project', 'sub_project')
+    # def onchange_parent_project_sub_project(self):
+    #     if self.parent_project.sub_project:
+    #         if self.parent_project:
+    #             user_list = self.parent_project.sub_project.ids
+    #             print('11111111111', self, self.id, self._origin.id)
+    #             user_list.append(self._origin.id)
+    #             self.parent_project.sub_project = user_list
+    #         else:
+    #             self.parent_project.sub_project = self.ids
+    #     if self.sub_project:
+    #         for rec in self.sub_project:
+    #             sub_project = self.env['project.project'].search([('id', '=', rec._origin.id)], limit=1)
+    #             sub_project.write({'parent_project': self._origin.id})
 
+    @api.model
+    def create(self, vals):
+        value = super(SubProject, self).create(vals)
+        if value and value.parent_project:
+            if value.parent_project.sub_project:
+                user_list = value.parent_project.sub_project.ids
+                user_list.append(value.id)
+                value.parent_project.sub_project = user_list
+            else:
+                value.parent_project.sub_project = value.ids
+        if value and value.sub_project:
+            value.write({'parent_project': value.id})
+        return value
 
+    def write(self, vals):
+        list1 = self.sub_project.ids
+        res = super(SubProject, self).write(vals)
+        if vals.get('parent_project'):
+            parent_prjt = self.env['project.project'].search([('id', '=', vals.get('parent_project'))], limit=1)
+            user_list = parent_prjt.sub_project.ids
+            user_list.append(self.id)
+            parent_prjt.sub_project = user_list
+        if vals.get('sub_project'):
+            list2 = self.sub_project.ids
+            if len(list2) > len(list1):
+                list3 = (set(list2)) - (set(list1))
+                for record in list(list3):
+                    self.env['project.project'].search([('id', '=', int(record))], limit=1).write(
+                        {'parent_project': self.id})
+            if len(list1) > len(list2):
+                list3 = (set(list1)) - (set(list2))
+                for record in list(list3):
+                    self.env['project.project'].search([('id', '=', int(record))], limit=1).write(
+                        {'parent_project': False, 'is_sub_project': False})
 
+        return res
 
 
 class InheritProjectTask(models.Model):