Add a new field to entity that won't allow to use the field manager

[stevengpn]

I'm trying to add "country code" field into the phoneNumber entity that doesn't give me a link to use the field manager, so I only added the JSON file as shown in the screenshot.
What do I need to do in order to get the phone number to split into the country code and the number itself, and display them properly on detail views of contacts/leads, like the 2nd attachment image?

I know it's a big question but really need to know how to get the backend and frontend work for this little task.

Thank you!

[stevengpn]

Let me narrow down the question: how could I add country code to the list template for phone at C:\WinNMP\WWW\EspoCRM\client\res\templates\fields\ phone\list.tpl? This only allows to show phone number by {{value}}, how can I add a value of country code which I managed to add to the database and the entityDefs JSON file.

[tanya]

Hello,
here you can find an example, how to override field in upgrade save way

https://forum.espocrm.com/forum/general/867-adding-new-field-to-addresses

[stevengpn]

Thank you.