I’m building a WP site and at one specific page i want to have a custom field in wich the user can select from existing content to be linked there. (english is not my native lang 🙂
In my case:
I have a services page where the admin can add new services.
I have a doctors page where the admin can add new doctors.
I want to have the option to link one doctor to one specific service.
Can this be done?
As other said, Advanced Custom Field is the answer to your and most needs regarding the data hierarchy management in wordpress.
In addiction I suggest to you to read this good tutorial about the use of Types, another good plugin that does the same work of ACF.
Considere moreover that both plugins ask money if you want more functionalities.
Here is the plugin url : http://wordpress.org/extend/plugins/advanced-custom-fields/ that makes relationship between custom filed. It will you.