To connect your custom domain to your Odoo website, follow these steps:

1. Add a CNAME Record:
   • Log in to your domain registrar.
   • Navigate to the DNS settings for your domain.
   • Create a CNAME record:
     • Host: www
     • Points to: <your-database>.odoo.com
     • Replace <your-database> with your actual Odoo database name.
2. Configure Domain in Odoo:
   • Go to Odoo Database Manager.
   • Click the gear icon next to your database name and select Domain Names.
   • Click Use my own domain, enter your domain (e.g., www.yourdomain.com), and click Verify.
   • Once verified, click I confirm, it’s done.
3. Set the Domain in Website Settings:
   • In Odoo, go to Website > Configuration > Settings.
   • Under Website Info, enter your domain in the Domain field and click Save.

This video may also be helpful:

https://youtu.be/-ufPcSaxU8U