Hi,To create custom Quotation Designs & Templates in the Odoo Sales app, follow these steps: Activate the settings from the “Quotations & Orders” header in the “Settings” window of the “Configuration” menu, then enable quote templates in Odoo Sales. Once enabled, a new “Default Template” field will become visible when you check the box next to the “Quotation Templates” option. You can access the page for creating, viewing, and updating templates by clicking the internal “Quotation Templates” link.For more information please refer to this blog: How to Customize Quotation Designs & Templates in the Odoo 17 Sales App

Hope it helps