Master Site for specific taxonomy in MultiSite

Question

I want to create "city" taxonomy in all sites of MultiSite. But i want to show same listing in every blog and i want to edit it from only master site and not letting other blog owners edit it. I think only solution for this is setting a master site for specific taxonomy in MultiSite. So when someone try to use "city" taxonomy from other blogs, they will see master site's city list. How can i do that?

<?php
$master_site = 1;
...when city taxonomy need:
switch_to_blog( $master_site );
...use list of "city" taxonomy"...
restore_current_blog();

Answer 1

First when you register your custom taxonomy use the capabilities argument and define your custom capabilities:

'capabilities' => array(
    'manage_terms' => 'manage_cities',
    'edit_terms'   => 'edit_cities',
    'delete_terms' => 'delete_cities',
    'assign_terms' => 'assign_cities'
),

and only give your users the assign_terms capability this way they wont be able to create new terms, only YOU.

Then use the nice solution you linked in the comment , change the $taxonomies_to_sync array according to your taxonomy, and you should be fine.