add new fields

tra_backend_Product/__init__.py

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+# -*- coding: utf-8 -*-
+# Part of Odoo. See LICENSE file for full copyright and licensing details.
+
+
+from . import models
+

tra_backend_Product/__manifest__.py

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+# -*- coding: utf-8 -*-
+# Part of Odoo. See LICENSE file for full copyright and licensing details.
+
+{
+    'name': 'Tra_Backend',
+    'version': '1.0',
+    'category': 'Product',
+    'sequence': 5,
+    'summary': 'Product',
+    'description': "",
+    'website': 'https://www.odoo.com/page/crm',
+    'depends': [
+    'product'
+    ],
+    'data': [
+        'views/product_views.xml',
+    ],
+    'demo': [
+       
+    ],
+    'css': [],
+    'installable': True,
+    'application': True,
+    'auto_install': False
+}

tra_backend_Product/models/__init__.py

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+# -*- coding: utf-8 -*-
+# Part of Odoo. See LICENSE file for full copyright and licensing details.
+
+
+from . import product

tra_backend_Product/models/product.py

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+# -*- coding: utf-8 -*-
+# Part of Odoo. See LICENSE file for full copyright and licensing details.
+
+import logging
+from psycopg2 import sql, extras
+from datetime import datetime, timedelta, date
+
+from odoo import api, fields, models, tools, SUPERUSER_ID
+
+
+class ProductProduct(models.Model):
+    _inherit = "product.template"
+
+    width = fields.Float('Width', digits='Stock Weight')
+    length = fields.Float('Length', digits='Stock Weight')
+    height = fields.Float('Height', digits='Stock Weight')
+    model_grade = fields.Char('Model/Grade')

tra_backend_Product/views/product_views.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<odoo>
+    <data>
+
+   <!-- view common to both template and product -->
+        <record id="product_template_form_view__inventory_inherit" model="ir.ui.view">
+            <field name="name">product.template.stock.property.form.inherit</field>
+            <field name="model">product.template</field>
+            <field name="inherit_id" ref="product.product_template_form_view"/>
+            <field name="arch" type="xml">
+                
+                <page name="inventory" position="inside">
+                    <xpath expr="//field[@name='weight']" position="after">
+                         <field name="width"/>
+                    </xpath>
+                </page>
+
+    
+            </field>
+        </record>
+      
+       
+
+</data>
+</odoo>