[ADD] sales_products_kit: add functionality to sell products as a kit in Sales

- Added a new "Is Kit" button to the product page for kit selection.
- If the product is a kit, sub-products can be selected in the order line.
- Introduced a wizard to adjust the quantity and price of sub-products.
- On confirmation, sub-products are added to the order line with price set to 0,
  and costs are moved to the parent product.
- Sub-products are automatically deleted if the parent product is removed.
- Added a "Print in Report?" boolean to control visibility of sub-products in
  reports and customer preview page.

Author: tshe-odoo

sales_products_kit/__init__.py

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+from . import models
+from . import wizard

sales_products_kit/__manifest__.py

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+{
+    "name": "Sales - Product_Kit",
+    "version": "1.0",
+    "description": """
+        This custom module adds a function to Odoo to sell products as a Kit, but not using a BOM or the Manufacturing Module.
+        """,
+    "category": "Sales/Sales",
+    "depends": ["sale_management"],
+    "data": [
+        "security/ir.model.access.csv",
+        "wizard/sub_product_wizard.xml",
+        "views/product_view.xml",
+        "views/sale_order_view.xml",
+        "report/sale_order_report.xml",
+        "views/sale_portal_templates.xml",
+        "report/invoice_report.xml",
+    ],
+    "installable": True,
+    "auto_install": False,
+    "license": "LGPL-3",
+}

sales_products_kit/models/__init__.py

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

sales_products_kit/models/product_template.py

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+from odoo import fields, models
+
+
+class ProductTemplate(models.Model):
+    _inherit = "product.template"
+
+    is_kit = fields.Boolean()
+    sub_product_ids = fields.Many2many("product.product", string="Sub Product")

sales_products_kit/models/sale_order.py

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+from odoo import models, fields
+
+
+class SaleOrder(models.Model):
+    _inherit = "sale.order"
+
+    print_in_report = fields.Boolean(string="Print in Report ?")

sales_products_kit/models/sale_order_line.py

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+from odoo import models, fields, api
+from odoo.exceptions import UserError
+
+
+class SaleOrderLine(models.Model):
+    _inherit = "sale.order.line"
+
+    is_kit = fields.Boolean(related="product_template_id.is_kit")
+    parent_line_id = fields.Many2one("sale.order.line", ondelete="cascade")
+
+    @api.ondelete(at_uninstall=False)
+    def _ondelete_sale_order_line(self):
+        for line in self:
+            sub_product_lines = self.env["sale.order.line"].search(
+                [("parent_line_id", "=", line.id)]
+            )
+            sub_product_lines.unlink()
+
+    def action_subproduct(self):
+        return {
+            "type": "ir.actions.act_window",
+            "name": f"Product: {self.product_id.name}",
+            "res_model": "sub.product.wizard",
+            "view_mode": "form",
+            "target": "new",
+            "context": {"default_sale_order_line_id": self.id},
+        }

sales_products_kit/report/invoice_report.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<odoo>
+    
+    <template id="invoice_document_report_inherited" inherit_id="account.report_invoice_document">
+        <xpath expr="//tbody/t/tr" position="attributes">
+            <attribute name="t-if">line.sale_line_ids.order_id.print_in_report or (not line.sale_line_ids.parent_line_id)</attribute>
+        </xpath>
+    </template>
+    
+</odoo>

sales_products_kit/report/sale_order_report.xml

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

sales_products_kit/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_sub_product_wizard,access_sub_product_wizard,model_sub_product_wizard,base.group_user,1,1,1,1
+access_sub_product_line,access_sub_product_line,model_sub_product_line,base.group_user,1,1,1,1

sales_products_kit/views/product_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.view.inherit.sales_products_kit</field>
+        <field name="model">product.template</field>
+        <field name="inherit_id" ref="sale.product_template_form_view" />
+        <field name="arch" type="xml">
+            <xpath expr="//group[@name='group_general']" position="inside">
+                <field name="is_kit"></field>
+                <field name="sub_product_ids" widget="many2many_tags" invisible="not is_kit"></field>
+            </xpath>
+        </field>
+    </record>
+</odoo>