1. create menu

              <odoo>
  <data>
   

    <!-- Top menu item -->
    <menuitem name="school" id="school.menu_root"/>


    <!-- menu categories -->
    <menuitem name="Activity" id="school.menu_1" parent="school.menu_root"/>
    <menuitem name="Masters" id="school.menu_2" parent="school.menu_root"/>



    <!-- actions -->
    <menuitem name="Teacher" id="school.menu_1_list" parent="school.menu_1"
              action=""/>
              
    <menuitem name="Student" id="school" parent="school.menu_2"
              action=""/>

  </data>
</odoo>

      

2. Create window action

1. id for linking the window and menu

2. res_model for populating default form fields

3. view_mode for form

          <!-- actions opening views on models -->

    <record model="ir.actions.act_window" id="school.action_window">
      <field name="name">school window</field>
      <field name="res_model">school.school</field>
      <field name="view_mode">tree,form</field>
    </record>




      

1. id="school.action_window" for menu linking
2. res_model">school.school is model name in models/school.py

3. link the menu and action

add menu action and set action window id

      <menuitem name="List" id="school.menu_1_list" parent="school.menu_1"
              action="school.action_window"/>