Hello Christophe KONAN If you're looking to do this with a custom model, you can use a custom module and handle the header, footer, and page content customization directly in the code.

I’ve already created a demo with code that shows how to customize all of these parts — header, footer, and the body content. - module link https://github.com/Rushik-Pitroda/odoo-custom-modules/tree/main/qweb_report

Hello,

You can use odoo standard configuration. I'll show you below ss 

1.

2.

Hi,

Please refer to the blog on How to Customize Header/Footer for All Reports in Odoo 17 ERP

Regards

Settings > Technical > Reports > Reports
Find the report you want to customize. This could be an invoice, quotation, or any other report.

In the QWeb template editor, locate the section where the header is defined. This is typically within

You can add HTML and CSS to customize the header. For example:

Your Custom Header Title