1. Create custom module

1. Enable developer mode

2. add custom-addons path in odoo.conf

                addons_path = e:\odoo\16\server\odoo\addons, e:\odoo\16\server\addons
                

3. new module

windows

Navigate to python.exe

                 //navigate 
                 cd  E:\odoo\python\python.exe
                 
                 //create new module
                 E:\odoo\server\odoo-bin scaffold school E:\odoo\server\addons

                  //restart service
                  go to searchbar -> type services -> restart odoo server
                

Linux

Navigate to location of odoo-bin

                ./odoo-bin scaffold school ../addons/

                //restart server
                sudo systemctl restart odoo14
                

2. Structure

                controllers
                    - __init__.py
                    - controllers.py
                demo
                    - demo.xml
                models
                    - __init__.py
                    - models.py
                security
                    - ir.model.access.csv
                views
                    - templates.xml
                    - views.xml
                
                __init__.py   
                __manifest__.py 
                

1 . all model should be added in models/__init__.py
2. all xml should be added in __manifest__.py
3. enable ir.model.access.csv in __manifest__.py 4. uncomment the code in models/models.py, security/ir.model.access.csv, view/views.xml

1. Enable Application Mode

open E:\odoo\16\server\addons\school\__manifest__.py

add 'application': True,

2. Module icon image

1.copy the image to E:\odoo\16\server\addons\school\static\description\icon.png

menu

                
    <menuitem name="csms" id="csms.menu_root"/>

    <!-- menu categories -->

    <menuitem name="Activities" id="csms.menu_1" parent="csms.menu_root"/>
    <menuitem name="Masters" id="csms.menu_2" parent="csms.menu_root"/>

    <!-- actions -->

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


    <menuitem name="Agent Master" id="menu_agent" parent="csms.menu_2"
            action="agent_action_window"/>
    <menuitem name="Country Master" id="menu_country" parent="csms.menu_2"
            action="country_action_window"/>

Action window

<record model="ir.actions.act_window" id="agent_action_window">
      <field name="name">Agent Master</field>
      <field name="res_model">csms.agent</field>
      <field name="view_mode">tree,form</field>
    </record>

    <record model="ir.actions.act_window" id="country_action_window">
      <field name="name">Country Master</field>
      <field name="res_model">csms.country</field>
      <field name="view_mode">tree,form</field>
    </record>