Limit Category/Tag Dropdown To blog_id in Multisite Install With Global Categories/Tags

The wp_dropdown_category seems to not accept the mera_query parameter codex Maybe you must perform à special query , note that the meta_query must be an array of array.

 'meta_query'=> array(
       array(
         'key'     => 'blog_id',
        'value'   => $blog_id,
        'compare' => '='
       )
 ),

With the new query you’ll be able to compose your dropdown by looping through result.

WP_Query custom field parameter

Hope it works with this ?

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