Odoo memberikan pengembang untuk membuat addons / module custom sesuai kebutuhan. Berikut tahapannya :
1. Di terminal, ketik docker ps
2. Lalu ketik docker exec -it [container_id] bash container_id merupakan ID dari image/container Odoo di docker.
3. Buat module baru dengan perintah : odoo scaffold [module_name] [custom_addons_location] Disini kita akan membuat module bernama Registration.
4. odoo scaffold registration /mnt/extra-addons
5. Rename models file dan buat model baru (customer model) di file addons/registration/models/customer.py.

6. Buat menu root & sub menu di file addons/registration/views/views.xml
<record id="action_customer_tree" model="ir.actions.act_window">
<field name="name">Customer</field>
<field name="res_model">customer.customer</field>
<field name="view_mode">tree,form</field>
<field name="help" type="html">
<p class="o_view_nocontent_smiling_face">
Create Customer Record
</p>
</field>
</record>
<!--Parent Menu Registration -->
<menuitem id="customer_menu_root" name="Registration" sequence="7"/>
<!--Menu Customer -->
<menuitem id="customer_menu"
name="Customer"
parent="registration.customer_menu_root"
action="action_customer_tree"/>
7. Buat view untuk tree (list) dan form di file baru addons/registration/views/customer_views.xml.
<?xml version="1.0" encoding="UTF-8" ?>
<odoo>
<data>
<!-- Customer Action-->
<record id="action_customer" model="ir.actions.act_window">
<field name="name">Customer</field>
<field name="res_model">customer.customer</field>
<field name="view_mode">tree,form</field>
<field name="help" type="html">
<p class="o_view_nocontent_smiling_face">
Create Customer Record
</p>
</field>
</record>
<!-- Customer Form View-->
<record id="customer_view_form" model="ir.ui.view">
<field name="name">customer.view.form</field>
<field name="model">customer.customer</field>
<field name="arch" type="xml">
<form string="Customer">
<sheet>
<group string="Customer">
<group>
<field name="name"/>
<field name="address"/>
</group>
<group>
<field name="priority"/>
<field name="register_date"/>
</group>
<group>
</group>
<group>
<field name="logo"/>
</group>
</group>
<notebook>
<page string="Customer Products">
<field name="customer_product_id">
<tree editable="bottom">
<field name="product_id"/>
<field name="stock"/>
<field name="tonase"/>
<field name="customer_id" invisible="1"/>
</tree>
</field>
</page>
</notebook>
</sheet>
</form>
</field>
</record>
<!--Employee Tree View-->
<record id="customer_view_tree" model="ir.ui.view">
<field name="name">customer.tree</field>
<field name="model">customer.customer</field>
<field name="arch" type="xml">
<tree>
<field name="name" string="Customer Name"/>
<field name="priority" string="Priority"/>
<field name="address" string="Address"/>
</tree>
</field>
</record>
</data>
</odoo>
8. Tambahkan path view di views/manifest.py

9. Set akses in csv file untuk model ini di manifest.py
access_customer_customer,customer.customer,model_customer_customer,base.group_user,1,1,1,1
10. Restart Odoo
11. Pergi ke menu Settings di Odoo, click Activate the developer mode di bagian Developer Tools.
12. Pergi ke menu Apps > Update App List > click tombol Update
13. Install registration module yang sudah dibuat.
Untuk lebih jelasnya, lihat video di youtube kami