add sub-project feater

sub_project/__init__.py

@@ -0,0 +1 @@
+from . import models

sub_project/__manifest__.py

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+{
+    'name': 'sub_project',
+    'version': '',
+    'summary': 'Sub Project of sub project',
+    'description': 'Sub Project of sub project',
+    'category': '',
+    'author': '',
+    'website': '',
+    'license': '',
+    'depends': ['base', 'project'],
+    'data': ['views/sub_project.xml'],
+    'demo': [''],
+    'installable': True,
+    'auto_install': False,
+
+}

sub_project/models/__init__.py

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+from . import sub_project

sub_project/models/sub_project.py

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+from odoo import api, fields, models
+
+
+class SubProject(models.Model):
+    _inherit = "project.project"
+    _description = "Sub Project"
+
+    is_sub_project = fields.Boolean("Is Sub Project")
+    parent_project = fields.Many2one('project.project', string='Parent Project')

sub_project/views/sub_project.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<odoo>
+    <data>
+
+        <record id="edit_project_inherited" model="ir.ui.view">
+            <field name="name">project.project.form.inherit</field>
+            <field name="model">project.project</field>
+            <field name="inherit_id" ref="project.edit_project"/>
+            <field name="arch" type="xml">
+                <data>
+                    <xpath expr="//page[@name='settings']" position="after">
+                        <page name="sub_project" string="Sub Project">
+                            <group>
+                                <field name="is_sub_project"/>
+                            </group>
+                            <group>
+                                <field name="parent_project"
+                                       options="{'no_open': True, 'no_create': True, 'no_create_edit': True}"/>
+                            </group>
+                        </page>
+                    </xpath>
+                </data>
+            </field>
+        </record>
+    </data>
+</odoo>