When we open recipient , we do see lot of GM specific fields. We want to add one more additional field.
How do we add that ?
the best way is to extend recipient schema in order to avoid malfunctions on built-in schemas or during future upgrades.
Create the extension schema with the same name as default schema but in your custom namespace (ex. cus:recipient) and add necessary fields there.
You have an example here: https://docs.adobe.com/content/help/en/campaign-classic/using/configuring-campaign-classic/editing-s...