fieldmanager_faq.php

<?php

add_action( 'init', function() {

	$fieldmanager = new Fieldmanager_Group( array(
		'name' => 'tc_faq_fields',
		'limit' => 0,
		'label' => 'New FAQ',
		'label_macro' => array( 'FAQ: %s', 'question' ),
		'add_more_label' => 'Add another FAQ',
		'collapsible' => true,
		'collapsed' => false,
		'sortable' => true,
		'children' => array(
			'question' => new Fieldmanager_Textfield( 'Question' ),
			'answer' => new Fieldmanager_TextArea( 'Answer' ),
		),
	) );

	$fieldmanager->add_meta_box( 'FAQ', array( 'faq' ) );

} );

✌️ https://github.com/alleyinteractive/wordpress-fieldmanager