Hi,

In Odoo Online (SaaS), all updates and customizations made through standard tools like Odoo Studio, automated actions, custom fields, or reports are retained and automatically migrated when your system is upgraded to the next version. Odoo’s upgrade service is designed to ensure that your customizations made using supported and upgrade-safe methods remain functional.

Please refer to the following links for more details:

1. https://www.odoo.com/documentation/17.0/administration/upgrade.html

1. https://www.odoo.com/documentation/16.0/administration/upgrade.html

Hope it helps.