Here’s how I do it.
$fields[‘job’][‘other_apply’] = array(
‘label’ => ‘Other Application Methods’,
‘type’ => ‘textarea’,
‘required’ => false,
‘placeholder’ => ”,
‘priority’ => 7
);
$other_apply= isset ( $values[ ‘job’ ][ ‘other_apply’ ] ) ? $values[ ‘job’ ][ ‘other_apply’ ] : null;
if ( $other_apply )
update_post_meta( $job_id, ‘_other_apply’, $other_apply);
$fields[‘_other_apply’] = array(
‘label’ => ‘Other Application Methods’,
‘type’ => ‘textarea’,
‘placeholder’ => ”,
‘description’ => ”
);