Task is to add new fields joining_date and salary

1. _mainfest.py

1. add depends module

2. add view xml

                'depends' : ['hr', 'account'],
                'data': [
                    'views/hr_employee_views.xml'
                ],

                

2. model

1. add '_inherit'

2. add new field

                class HrEmployee(models.Model):
                    _inherit = 'hr.employee'

                    joining_date = fields.Date('Joining Date')
              

3. view

1. add id

2. add name

3. add model

4. add inherit_id

5. add new fields

              <odoo>
    <data>
        <record id="custom_hr_employee_form" model="ir.ui.view">
            <field name="name">custom.employee.form.view</field>
            <field name="model">hr.employee</field>
            <field name="inherit_id" ref="hr.view_employee_form"/>
            <field name="arch" type="xml">

                <field name="work_email" position="after">
                    <field name="joining_date"/>
                    <field name="salary_amount"/>
                </field>
                
               
            </field>
    </record>
    </data>
</odoo>