Get all posts from custom post type and insert in select input as metabox

(0. Retrieve the meta value with get_post_custom (in order to highlight the selected value in the select input).)

  1. Query posts with get_posts( array( 'post_type' => 'services', 'post_status' => 'publish' ) )

  2. Loop through the results with foreach and build your select input.

  3. Hook into save_post (add_action('save_post', 'my_save_meta') to store the selected value (with update_post_meta).

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