You can create your own fields to add to your contacts.

Add custom data to a contact

Manage available fields

You can access the screen to manage available custom data from the contact profile

or from lists and searches

On this screen, you can change the name of a field, delete it, or create new ones-Deleting a custom field from this list will remove it from all contacts on the list..

When you delete a custom field from this list, it will be deleted from all contacts.