How to add fields in odoo:

First, a subtype is a grouping of messages. We can configure the triggering conditions for subtypes in the code. Each follower can select the subtypes they are interested in for each specific document. If the document has a message of that subtype, Odoo will notify the followers who have subscribed to that subtype through the built-in messaging system/email. Parent: Sales order confirmed | Related field: team_id Here, the parent: "Sales team confirmed" is a subtype defined on the sales order, and the related field is the field name on the sales order that stores the sales team. The configuration here means: when a sales order is created, it will find the related