Code 1:
# -*- coding: utf-8 -*-

from odoo import models, fields
from odoo.exceptions import ValidationError

class HelpdeskTicket(models.Model):
_inherit = 'helpdesk.ticket'

sale_id = fields.Many2one('sale.order', 'Sale Order', copy=False)

def action_create_quote(self):
"""Create a new quote from the helpdesk ticket."""
# Create a new sale order
if not self.partner_id :
raise ValidationError('Customer is required to create a new Quotation')

sale_order = self.env['sale.order'].create({
'partner_id': self.partner_id.id,
'date_order': fields.Datetime.now(),
'state': 'draft',
'ticket_id': self.id,
})
self.sale_id = sale_order.id
return {
'name': 'Quote',
'view_type': 'form',
'view_mode': 'form',
'res_model': 'sale.order',
'res_id': sale_order.id,
'type': 'ir.actions.act_window',
'target': 'current',
}

Code 2:
# -*- coding: utf-8 -*-

from odoo import models, fields

class SaleOrder(models.Model):
_inherit = 'sale.order'

ticket_id = fields.Many2one('helpdesk.ticket', "Helpdesk Ticket", copy=False)

Code 3 :
<?xml version="1.0" encoding="utf-8"?>
<odoo>
<data>
<record id="view_helpdesk_ticket_form_inherit" model="ir.ui.view">
<field name="name">helpdesk.ticket.form.inherit.quote</field>
<field name="model">helpdesk.ticket</field>
<field name="inherit_id" ref="helpdesk.helpdesk_ticket_view_form"/>
<field name="arch" type="xml">
<xpath expr="//header" position="inside">
<button name="action_create_quote" type="object"
class="btn-primary" string="New Quotation"
invisible="sale_id != False"/>
</xpath>
<xpath expr="//field[@name='email_cc']" position="after">
<field name="sale_id" readonly="1"/>
</xpath>
</field>
</record>

<record id="view_sale_order_form_inherit" model="ir.ui.view">
<field name="name">sale.order.form.inherit.quote</field>
<field name="model">sale.order</field>
<field name="inherit_id" ref="sale.view_order_form"/>
<field name="arch" type="xml">
<xpath expr="//field[@name='payment_term_id']" position="after">
<field name="ticket_id" readonly="1"/>
</xpath>
</field>
</record>
</data>
</odoo>

Thank you very much Jainesh, I appriciate.