Hi,

Please refer to the link:

1. https://www.cybrosys.com/blog/how-to-create-backend-records-from-website-forms-in-odoo-18

Example of creating a res.partner record from a website form via XML + controller in a custom module

2.  https://www.cybrosys.com/blog/how-to-create-a-custom-web-form-view-in-odoo-17

Step-by-step for a custom model + form + controller method

Hope it helps

thank you!!! do you know how to make "create a lead" option show in the form action?

The Create a Customer option for website forms is introduced with the eCommerce App.

Alternatively, you can install the CRM App. This would allow you to Create an Opportunity from the website form (which then could be converted into a 'Customer' (Contact) upon creating a Sale Order for that Opportunity).

Side note: The way Odoo works would also allow you to install eCommerce and directly uninstall it again. This way, the Create a Customer option is registered in the website form and can be used but your database is not running too many unnecessary Apps either.
Do not attempt to do this in your production database without testing it in a Test/Staging database beforehand though!