Synchronize Wordpress Custom Meta Fields for Custom Field Suite. This will not work if your field group(s) use loop or relationship fields.

cfs_map_values_updated

// source: https://uproot.us/forums/questions/1511/importing-data
/*
 * ============================== EXPERIMENTAL CUSTOM FIELDS SUITE FIELD SYNC ============================
 *
 *  Importing posts with custom fields even when their names match those in CFS groups. still doesn't make
 *  them visible to CFS. The map_fields_values below is from a forum post on uproot's site:
 *  https://uproot.us/forums/questions/1511/importing-data
 *
 *    I have hard-coded the group ID for staff_bios into _sync_cfs_fields(). Call this function after
 *  import.
 * =======================================================================================================
 */

function _sync_cfs_fields(){
  $staff_bios_id = 85;
  $options['field_groups'] = array($staff_bios_id); // Group ID's that needs to be synced
  $result = _map_values_updated($options);
  echo $result;die();

}
//
// To perform the sync, uncomment the next line and reload site a single time. then re-comment it.
//
//_sync_cfs_fields();
//

  function _map_values_updated($options)
  {
  	global $wpdb;

  	if (isset($options['field_groups']))
  	{
  		$group_ids = (array) $options['field_groups'];
  		foreach ($group_ids as $group_id)
  		{
  			$rules = get_post_meta($group_id, 'cfs_rules', true);
  			$post_types = $post_ids = $term_ids = '';
  			$fields = array();
  			// Get this group's fields
  			$results = get_post_meta($group_id, 'cfs_fields', true);
  			foreach ($results as $result)
  			{
  				$fields[$result['name']] = $result['id'];
  			}
  			if (isset($rules['post_types']))
  			{
  				$post_types = implode("','", $rules['post_types']['values']);
  				$operator = ('==' == $rules['post_types']['operator']) ? 'IN' : 'NOT IN';
  				$post_types = " AND p.post_type $operator ('$post_types')";
  			}
  			if (isset($rules['post_ids']))
  			{
  				$post_ids = implode(',', $rules['post_ids']['values']);
  				$operator = ('==' == $rules['post_ids']['operator']) ? 'IN' : 'NOT IN';
  				$post_ids = " AND p.ID $operator ($post_ids)";
  			}
  			if (isset($rules['term_ids']))
  			{
  				$term_ids = implode(',', $rules['term_ids']['values']);
  				$operator = ('==' == $rules['term_ids']['operator']) ? 'IN' : 'NOT IN';
  				$term_ids = "
  				INNER JOIN $wpdb->term_relationships tr ON tr.object_id = p.ID
  				INNER JOIN $wpdb->term_taxonomy tt ON tt.term_taxonomy_id = tr.term_taxonomy_id AND tt.term_id $operator ($term_ids)";
  			}
  			$sql = "
  			SELECT m.meta_id, m.post_id, m.meta_key
  			FROM $wpdb->postmeta m
  			INNER JOIN $wpdb->posts p ON p.ID = m.post_id $post_types $post_ids $term_ids
  			LEFT JOIN {$wpdb->prefix}cfs_values v ON v.meta_id = m.meta_id
  			WHERE v.meta_id IS NULL";
  			$results = $wpdb->get_results($sql);
  			$tuples = array();
  			foreach ($results as $result)
  			{
  				if (isset($fields[$result->meta_key]))
  				{
  					$field_id = $fields[$result->meta_key];
  					$tuples[] = "($field_id, $result->meta_id, $result->post_id, 0, 0)";
  				}
  			}
  			if (0 < count($tuples))
  			{
  				$wpdb->query("INSERT INTO {$wpdb->prefix}cfs_values (field_id, meta_id, post_id, weight, sub_weight) VALUES " . implode(',', $tuples));
  			}
  		}
  		return 'Sync successful';
  	}
  	else
  	{
  		return '<div>' . __('No field groups selected', 'cfs') . '</div>';
  	}
  }