Hello Guhan Dhamodiraswamy,

Try the following code.

1. Inherit mrp.production and line model:

from odoo import models, fields

class MrpProductionLine(models.Model):

    _inherit = 'mrp.production.line'

    display_type = fields.Selection([

        ('line_section', "Section"),

        ('line_note', "Note"),

    ], default=False)

2. Inherit XML view and added the fields

<!-- views/mrp_production_view.xml -->

<odoo>

  <record id="view_mrp_production_form_inherit_sections" model="ir.ui.view">

    <field name="name">mrp.production.form.inherit.sections</field>

    <field name="model">mrp.production</field>

    <field name="inherit_id" ref="mrp.mrp_production_form_view"/>

    <field name="arch" type="xml">

      <xpath expr="//field[@name='move_raw_ids']" position="attributes">

        <attribute name="context">{'default_display_type': False}</attribute>

      </xpath>

      <xpath expr="//field[@name='move_raw_ids']/tree" position="before">

        <header>

          <button name="add_section" string="Add a section" type="object" class="oe_highlight"/>

          <button name="add_note" string="Add a note" type="object"/>

        </header>

      </xpath>

      <xpath expr="//field[@name='move_raw_ids']/tree/field[@name='product_id']" position="before">

        <field name="display_type" invisible="1"/>

      </xpath>

      <xpath expr="//field[@name='move_raw_ids']/tree" position="attributes">

        <attribute name="decoration-muted">display_type != False</attribute>

      </xpath>

    </field>

  </record>

</odoo>

3. Add add_section and add_note Methods in the mrp.production:

def add_section(self):

        for order in self:

            order.move_raw_ids += self.env['mrp.production.line'].new({

                'display_type': 'line_section',

                'name': 'New Section',

            })

    def add_note(self):

        for order in self:

            order.move_raw_ids += self.env['mrp.production.line'].new({

                'display_type': 'line_note',

                'name': 'New Note',

            })