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diff --git a/addons/sale_management/models/sale_order.py b/addons/sale_management/models/sale_order.py
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+++ b/addons/sale_management/models/sale_order.py
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+# -*- coding: utf-8 -*-
+# Part of Odoo. See LICENSE file for full copyright and licensing details.
+
+from datetime import timedelta
+
+from odoo import api, fields, models, _
+from odoo.exceptions import UserError, ValidationError
+
+
+class SaleOrder(models.Model):
+    _inherit = 'sale.order'
+
+    @api.model
+    def default_get(self, fields_list):
+        default_vals = super(SaleOrder, self).default_get(fields_list)
+        if "sale_order_template_id" in fields_list and not default_vals.get("sale_order_template_id"):
+            company_id = default_vals.get('company_id', False)
+            company = self.env["res.company"].browse(company_id) if company_id else self.env.company
+            default_vals['sale_order_template_id'] = company.sale_order_template_id.id
+        return default_vals
+
+    sale_order_template_id = fields.Many2one(
+        'sale.order.template', 'Quotation Template',
+        readonly=True, check_company=True,
+        states={'draft': [('readonly', False)], 'sent': [('readonly', False)]},
+        domain="['|', ('company_id', '=', False), ('company_id', '=', company_id)]")
+    sale_order_option_ids = fields.One2many(
+        'sale.order.option', 'order_id', 'Optional Products Lines',
+        copy=True, readonly=True,
+        states={'draft': [('readonly', False)], 'sent': [('readonly', False)]})
+
+    @api.constrains('company_id', 'sale_order_option_ids')
+    def _check_optional_product_company_id(self):
+        for order in self:
+            companies = order.sale_order_option_ids.product_id.company_id
+            if companies and companies != order.company_id:
+                bad_products = order.sale_order_option_ids.product_id.filtered(lambda p: p.company_id and p.company_id != order.company_id)
+                raise ValidationError(_(
+                    "Your quotation contains products from company %(product_company)s whereas your quotation belongs to company %(quote_company)s. \n Please change the company of your quotation or remove the products from other companies (%(bad_products)s).",
+                    product_company=', '.join(companies.mapped('display_name')),
+                    quote_company=order.company_id.display_name,
+                    bad_products=', '.join(bad_products.mapped('display_name')),
+                ))
+
+    @api.returns('self', lambda value: value.id)
+    def copy(self, default=None):
+        if self.sale_order_template_id and self.sale_order_template_id.number_of_days > 0:
+            default = dict(default or {})
+            default['validity_date'] = fields.Date.context_today(self) + timedelta(self.sale_order_template_id.number_of_days)
+        return super(SaleOrder, self).copy(default=default)
+
+    @api.onchange('partner_id')
+    def onchange_partner_id(self):
+        super(SaleOrder, self).onchange_partner_id()
+        template = self.sale_order_template_id.with_context(lang=self.partner_id.lang)
+        self.note = template.note or self.note
+
+    def _compute_line_data_for_template_change(self, line):
+        return {
+            'display_type': line.display_type,
+            'name': line.name,
+            'state': 'draft',
+        }
+
+    def _compute_option_data_for_template_change(self, option):
+        price = option.product_id.lst_price
+        discount = 0
+
+        if self.pricelist_id:
+            pricelist_price = self.pricelist_id.with_context(uom=option.uom_id.id).get_product_price(option.product_id, 1, False)
+
+            if self.pricelist_id.discount_policy == 'without_discount' and price:
+                discount = max(0, (price - pricelist_price) * 100 / price)
+            else:
+                price = pricelist_price
+
+        return {
+            'product_id': option.product_id.id,
+            'name': option.name,
+            'quantity': option.quantity,
+            'uom_id': option.uom_id.id,
+            'price_unit': price,
+            'discount': discount
+        }
+
+    def update_prices(self):
+        self.ensure_one()
+        res = super().update_prices()
+        for line in self.sale_order_option_ids:
+            line.price_unit = self.pricelist_id.get_product_price(line.product_id, line.quantity, self.partner_id, uom_id=line.uom_id.id)
+        return res
+
+    @api.onchange('sale_order_template_id')
+    def onchange_sale_order_template_id(self):
+
+        if not self.sale_order_template_id:
+            self.require_signature = self._get_default_require_signature()
+            self.require_payment = self._get_default_require_payment()
+            return
+
+        template = self.sale_order_template_id.with_context(lang=self.partner_id.lang)
+
+        # --- first, process the list of products from the template
+        order_lines = [(5, 0, 0)]
+        for line in template.sale_order_template_line_ids:
+            data = self._compute_line_data_for_template_change(line)
+
+            if line.product_id:
+                price = line.product_id.lst_price
+                discount = 0
+
+                if self.pricelist_id:
+                    pricelist_price = self.pricelist_id.with_context(uom=line.product_uom_id.id).get_product_price(line.product_id, 1, False)
+
+                    if self.pricelist_id.discount_policy == 'without_discount' and price:
+                        discount = max(0, (price - pricelist_price) * 100 / price)
+                    else:
+                        price = pricelist_price
+
+                data.update({
+                    'price_unit': price,
+                    'discount': discount,
+                    'product_uom_qty': line.product_uom_qty,
+                    'product_id': line.product_id.id,
+                    'product_uom': line.product_uom_id.id,
+                    'customer_lead': self._get_customer_lead(line.product_id.product_tmpl_id),
+                })
+
+            order_lines.append((0, 0, data))
+
+        self.order_line = order_lines
+        self.order_line._compute_tax_id()
+
+        # then, process the list of optional products from the template
+        option_lines = [(5, 0, 0)]
+        for option in template.sale_order_template_option_ids:
+            data = self._compute_option_data_for_template_change(option)
+            option_lines.append((0, 0, data))
+
+        self.sale_order_option_ids = option_lines
+
+        if template.number_of_days > 0:
+            self.validity_date = fields.Date.context_today(self) + timedelta(template.number_of_days)
+
+        self.require_signature = template.require_signature
+        self.require_payment = template.require_payment
+
+        if template.note:
+            self.note = template.note
+
+    def action_confirm(self):
+        res = super(SaleOrder, self).action_confirm()
+        for order in self:
+            if order.sale_order_template_id and order.sale_order_template_id.mail_template_id:
+                self.sale_order_template_id.mail_template_id.send_mail(order.id)
+        return res
+
+    def get_access_action(self, access_uid=None):
+        """ Instead of the classic form view, redirect to the online quote if it exists. """
+        self.ensure_one()
+        user = access_uid and self.env['res.users'].sudo().browse(access_uid) or self.env.user
+
+        if not self.sale_order_template_id or (not user.share and not self.env.context.get('force_website')):
+            return super(SaleOrder, self).get_access_action(access_uid)
+        return {
+            'type': 'ir.actions.act_url',
+            'url': self.get_portal_url(),
+            'target': 'self',
+            'res_id': self.id,
+        }
+
+
+class SaleOrderLine(models.Model):
+    _inherit = "sale.order.line"
+    _description = "Sales Order Line"
+
+    sale_order_option_ids = fields.One2many('sale.order.option', 'line_id', 'Optional Products Lines')
+
+    # Take the description on the order template if the product is present in it
+    @api.onchange('product_id')
+    def product_id_change(self):
+        domain = super(SaleOrderLine, self).product_id_change()
+        if self.product_id and self.order_id.sale_order_template_id:
+            for line in self.order_id.sale_order_template_id.sale_order_template_line_ids:
+                if line.product_id == self.product_id:
+                    self.name = line.with_context(lang=self.order_id.partner_id.lang).name + self._get_sale_order_line_multiline_description_variants()
+                    break
+        return domain
+
+
+class SaleOrderOption(models.Model):
+    _name = "sale.order.option"
+    _description = "Sale Options"
+    _order = 'sequence, id'
+
+    is_present = fields.Boolean(string="Present on Quotation",
+                           help="This field will be checked if the option line's product is "
+                                "already present in the quotation.",
+                           compute="_compute_is_present", search="_search_is_present")
+    order_id = fields.Many2one('sale.order', 'Sales Order Reference', ondelete='cascade', index=True)
+    line_id = fields.Many2one('sale.order.line', ondelete="set null", copy=False)
+    name = fields.Text('Description', required=True)
+    product_id = fields.Many2one('product.product', 'Product', required=True, domain=[('sale_ok', '=', True)])
+    price_unit = fields.Float('Unit Price', required=True, digits='Product Price')
+    discount = fields.Float('Discount (%)', digits='Discount')
+    uom_id = fields.Many2one('uom.uom', 'Unit of Measure ', required=True, domain="[('category_id', '=', product_uom_category_id)]")
+    product_uom_category_id = fields.Many2one(related='product_id.uom_id.category_id', readonly=True)
+    quantity = fields.Float('Quantity', required=True, digits='Product Unit of Measure', default=1)
+    sequence = fields.Integer('Sequence', help="Gives the sequence order when displaying a list of optional products.")
+
+    @api.depends('line_id', 'order_id.order_line', 'product_id')
+    def _compute_is_present(self):
+        # NOTE: this field cannot be stored as the line_id is usually removed
+        # through cascade deletion, which means the compute would be false
+        for option in self:
+            option.is_present = bool(option.order_id.order_line.filtered(lambda l: l.product_id == option.product_id))
+
+    def _search_is_present(self, operator, value):
+        if (operator, value) in [('=', True), ('!=', False)]:
+            return [('line_id', '=', False)]
+        return [('line_id', '!=', False)]
+
+    @api.onchange('product_id', 'uom_id', 'quantity')
+    def _onchange_product_id(self):
+        if not self.product_id:
+            return
+        product = self.product_id.with_context(
+            lang=self.order_id.partner_id.lang,
+            partner=self.order_id.partner_id,
+            quantity=self.quantity,
+            date=self.order_id.date_order,
+            pricelist=self.order_id.pricelist_id.id,
+            uom=self.uom_id.id,
+            fiscal_position=self.env.context.get('fiscal_position')
+        )
+        self.name = product.get_product_multiline_description_sale()
+        self.uom_id = self.uom_id or product.uom_id
+        # To compute the discount a so line is created in cache
+        values = self._get_values_to_add_to_order()
+        new_sol = self.env['sale.order.line'].new(values)
+        new_sol._onchange_discount()
+        self.discount = new_sol.discount
+        if self.order_id.pricelist_id and self.order_id.partner_id:
+            self.price_unit = new_sol._get_display_price(product)
+
+    def button_add_to_order(self):
+        self.add_option_to_order()
+
+    def add_option_to_order(self):
+        self.ensure_one()
+
+        sale_order = self.order_id
+
+        if sale_order.state not in ['draft', 'sent']:
+            raise UserError(_('You cannot add options to a confirmed order.'))
+
+        values = self._get_values_to_add_to_order()
+        order_line = self.env['sale.order.line'].create(values)
+        order_line._compute_tax_id()
+
+        self.write({'line_id': order_line.id})
+        if sale_order:
+            sale_order.add_option_to_order_with_taxcloud()
+
+
+    def _get_values_to_add_to_order(self):
+        self.ensure_one()
+        return {
+            'order_id': self.order_id.id,
+            'price_unit': self.price_unit,
+            'name': self.name,
+            'product_id': self.product_id.id,
+            'product_uom_qty': self.quantity,
+            'product_uom': self.uom_id.id,
+            'discount': self.discount,
+            'company_id': self.order_id.company_id.id,
+        }