traversal

<?php

$args = array(
  'meta_query' => array(
    array(
    	'key'     => 'fields.type',
    	'value'   => 'bnb',
    	'compare' => '=',
    )
  )   

traversal

<?php

global $wf;

// suppose you have a post of type "family", slug "smith-family", with field set "details", and field "education_levels"

$selections = $wf->family( "smith-family" )->details->education_levels->selections();

// $selections is now a value-label pair of the current selections.