Hi,

Please refer to the code:

from odoo import api, fields, models

from odoo.exceptions import UserError

class SaleOrder(models.Model):

    _inherit = "sale.order"

    project_id = fields.Many2one('project.project', string="Project")

    def action_create_project(self):

        for order in self:

            if order.project_id:

                raise UserError("This Sales Order already has a linked project.")

            seq = self.env['ir.sequence'].next_by_code('project.seq') or order.name

            opp_name = order.opportunity_id.name if order.opportunity_id else ""

            project_name = f"{seq} | {opp_name}" if opp_name else seq

            project = self.env['project.project'].create({

                'name': project_name,

                'partner_id': order.partner_id.id,

            })

            order.project_id = project.id

Hope it helps.

Hi,

if record. project_id:

    raise UserError("This Sales Order already has a linked project.")

# Get sequence value or fallback

seq = env['ir.sequence'].next_by_code('project.seq') or 'NEW/PROJECT'

# Get opportunity name if exists

opp_name = record.opportunity_id.name if record.opportunity_id else ''

# Build project name

project_name = f"{seq} | {opp_name}" if opp_name else seq

# Create new project

project = env['project.project'].create({

    'name': project_name,

    'partner_id': project.id })

try this 
i hope it is use full

In Odoo, a project is typically created from a Sales Order when you sell a service product that is configured to trigger project creation.

✅ Steps:

1. Go to Sales > Products and open the service product.
2. Set:
   • Product Type: Service
   • Service Invoicing Policy: Based on Milestones or Timesheets on Tasks
   • Service Tracking: Choose one of the following:
     • Create a task in an existing project
     • Create a new project but no task
     • Create a new project and task
3. When you confirm a Sales Order containing that product, Odoo will automatically create the project or task depending on your selection.

You can then manage the project from the Projects module.