[ADD] product_kit_type: introduce kit product type with subproduct handling in SO

- Added new product type **Kit** (`is_kit`) in product form view with option to select subproducts
- When a kit product is added to a Sales Order:
  • A button appears next to the product line to open a wizard
  • Wizard allows setting quantity and price for each subproduct
  • On save, subproduct lines are added to the SO as readonly order lines
  • Main kit product price is updated based on wizard values

- Added option in Sales Orders to enable/disable printing of subproduct lines:
  • Affects customer invoice printing
  • Affects customer portal preview

Author: piso-odoo

product_kit_type/__init__.py

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+from . import models
+from . import wizard

product_kit_type/__manifest__.py

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+{
+    'name': 'Product Type Kit',
+    'version': '1.0',
+    'category': 'Sales/Sales',
+    'summary': 'Allow selecting salesperson for pos order',
+    'depends': ['sale_management'],
+    'installable': True,
+    'data': [
+        'security/ir.model.access.csv',
+        'views/product_template_form_view.xml',
+        'views/sale_order_views.xml',
+        'views/sale_order_customer_preview.xml',
+        'wizard/views/sub_products_view.xml',
+        'report/invoice_report.xml'
+    ],
+    'license': 'LGPL-3',
+}

product_kit_type/models/__init__.py

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+from . import product_template
+from . import sale_order_line
+from . import sale_order

product_kit_type/models/product_template.py

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+from odoo import models, fields, api
+
+
+class InheritedProductTemplate(models.Model):
+    _inherit = "product.template"
+
+    is_kit = fields.Boolean("Is kit?")
+    sub_products = fields.Many2many("product.product", string="Sub Products")
+
+    @api.onchange("is_kit")
+    def _onchange_is_kit(self):
+        if not self.is_kit:
+            self.sub_products = None

product_kit_type/models/sale_order.py

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+from odoo import models, fields
+
+
+class InheritedSalesOrder(models.Model):
+    _inherit = "sale.order"
+
+    print_in_report = fields.Boolean()

product_kit_type/models/sale_order_line.py

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+from odoo import models, fields
+
+
+class InheritedSalesOrderLine(models.Model):
+    _inherit = "sale.order.line"
+
+    is_kit = fields.Boolean(related="product_template_id.is_kit", store=False)
+    is_sub_product = fields.Boolean()
+
+    def action_sub_products(self):
+        return {
+            'name': f'Product: {self.name}',
+            'view_mode': 'form',
+            'res_model': 'product_kit_type.subproducts',
+            'view_id': self.env.ref('product_kit_type.subproducts_view_form').id,
+            'type': 'ir.actions.act_window',
+            'target': 'new',
+        }
+
+    def unlink(self):
+        for line in self:
+            if not line.is_sub_product:
+                sale_order_line_id = line.id
+                sub_lines = self.search([
+                    ('product_id', '=', line.product_id.id),
+                    ('is_sub_product', '=', True),
+                    ('linked_line_id', '=', sale_order_line_id)
+                ])
+                if sub_lines:
+                    sub_lines.unlink()
+        return super().unlink()

product_kit_type/report/invoice_report.xml

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+<?xml version="1.0" encoding="UTF-8" ?>
+<odoo>
+    <template id="sale_order_report_inherit" inherit_id="sale.report_saleorder_document">
+        <xpath expr="//tbody/t/tr" position="attributes">
+            <attribute name="t-if">(doc.print_in_report) or (not line.is_sub_product)</attribute>
+        </xpath>
+    </template>
+</odoo>

product_kit_type/security/ir.model.access.csv

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+id,name,model_id:id,group_id:id,perm_read,perm_write,perm_create,perm_unlink
+access_subproducts,access_product_kit_type.subproducts,product_kit_type.model_product_kit_type_subproducts,base.group_user,1,1,1,
+access_subproducts_lines,access_product_kit_type.subproducts.line,product_kit_type.model_product_kit_type_subproducts_line,base.group_user,1,1,1,

product_kit_type/views/product_template_form_view.xml

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+<?xml version="1.0" encoding="UTF-8" ?>
+<odoo>
+    <record id="product_template_form_view_inherit" model="ir.ui.view">
+        <field name="name">product.template.form.inherit.product_type_kit</field>
+        <field name="model">product.template</field>
+        <field name="inherit_id" ref="product.product_template_form_view" />
+        <field name="arch" type="xml">
+            <xpath expr="//page[@name='general_information']//group[@name='group_general']" position="inside">
+                <field name="is_kit" />
+                <field name="sub_products" invisible="not is_kit" widget="many2many_tags" />
+            </xpath>
+        </field>
+    </record>    
+</odoo>

product_kit_type/views/sale_order_customer_preview.xml

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+<?xml version="1.0" encoding="UTF-8" ?>
+<odoo>
+    <template id="sale_portal_templates_report_inherit" inherit_id="sale.sale_order_portal_content">
+        <xpath expr="//table[@id='sales_order_table']/tbody/t/tr" position="attributes">
+            <attribute name="t-if">(sale_order.print_in_report) or (not line.is_sub_product)</attribute>
+        </xpath>
+    </template>
+ </odoo>
+