Flexible Field like ACF use Meta Box Plugin

flexible-by-meta-box

add_filter( 'rwmb_meta_boxes', 'your_prefix_register_meta_boxes' );
function your_prefix_register_meta_boxes( $meta_boxes ) {
	$meta_boxes[] = array (
		'title' => 'Flexible Field Example',
		'id' => 'flexible-field-example',
		'post_types' => array(
			0 => 'page',
		),
		'context' => 'normal',
		'priority' => 'high',
		'fields' => array(
			array (
				'id' => 'sections',
				'type' => 'group',
				'name' => 'Sections',
				'fields' => array(
					array (
						'id' => 'select',
						'name' => 'Select',
						'type' => 'select',
						'placeholder' => 'Select an Item',
						'options' => array(
							'Services' => 'Services',
							'Testimonials' => 'Testimonials',
							'Facts' => 'Facts',
						),
					),
					array (
						'id' => 'services',
						'type' => 'group',
						'name' => 'Services',
						'fields' => array(
							array (
								'id' => 'secvices_box',
								'type' => 'group',
								'name' => 'Secvices Box',
								'fields' => array(
									array (
										'id' => 'image',
										'type' => 'single_image',
										'name' => 'Icon services',
										'desc' => 'Transparent background',
									),
									array (
										'id' => 'description',
										'type' => 'textarea',
										'name' => 'Description',
									),
								),
								'clone' => 1,
								'default_state' => 'expanded',
								'collapsible' => true,
								'group_title' => 'Secvices Box',
							),
						),
						'default_state' => 'expanded',
						'collapsible' => true,
						'save_state' => true,
						'group_title' => 'Services Section',
						'visible' => array(
							'when' => array(
								array (
									0 => 'select',
									1 => '=',
									2 => 'Services',
								),
							),
							'relation' => 'and',
						),
					),
					array (
						'id' => 'testimonials',
						'type' => 'group',
						'name' => 'Testimonials',
						'fields' => array(
							array (
								'id' => 'testimonials_box',
								'type' => 'group',
								'name' => 'Testimonials Box',
								'fields' => array(
									array (
										'id' => 'image_upload_2',
										'type' => 'image_upload',
										'name' => 'Image profile',
										'max_status' => false,
										'max_file_uploads' => 2,
										'image_size' => 'thumbnail',
									),
									array (
										'id' => 'Content',
										'name' => 'Content',
										'type' => 'wysiwyg',
									),
								),
								'default_state' => 'expanded',
							),
						),
						'default_state' => 'expanded',
						'collapsible' => true,
						'save_state' => true,
						'group_title' => 'Testimonials Section',
						'visible' => array(
							'when' => array(
								array (
									0 => 'select',
									1 => '=',
									2 => 'Testimonials',
								),
							),
							'relation' => 'and',
						),
					),
					array (
						'id' => 'facts',
						'type' => 'group',
						'name' => 'Facts',
						'fields' => array(
							array (
								'id' => 'title',
								'type' => 'text',
								'name' => 'Title Fact',
							),
							array (
								'id' => 'textarea_2',
								'type' => 'textarea',
								'name' => 'Description Fact',
							),
							array (
								'id' => 'group_2',
								'type' => 'group',
								'name' => 'Fact Box',
								'fields' => array(
									array (
										'id' => 'text_2',
										'type' => 'text',
										'name' => 'Title',
									),
									array (
										'id' => 'number_2',
										'type' => 'number',
										'name' => 'Amount',
									),
								),
								'default_state' => 'expanded',
							),
						),
						'default_state' => 'expanded',
						'collapsible' => true,
						'group_title' => 'Facts Section',
						'visible' => array(
							'when' => array(
								array (
									0 => 'select',
									1 => '=',
									2 => 'Facts',
								),
							),
							'relation' => 'and',
						),
					),
				),
				'clone' => 1,
				'default_state' => 'expanded',
				'collapsible' => true,
				'save_state' => true,
				'group_title' => 'Choose which section you want',
			),
		),
		'include' => array(
			'relation' => 'OR',
			'ID' => 2,
			'template' => array(
				0 => 'page.php',
			),
		),
	);
	return $meta_boxes;
}