In the section called Manage fields within a content type, there is an option called Add an existing field. How this field is activated?
Some time ago I installed Drupal 7.38 and I worked with such option. This option was there. I never knew how it appeared there.
Now, I have two new Drupal installations (7.38 and 7.40). None of them shows by default the option called "Add an existing field".
Does the option "Add an existing field" belong to Drupal core or to some contributed module?