Add the group name in the cart and order

add-group-name.php

<?php 
// Filter the data in the cart / checkout
add_filter( 'mkl_pc/wc_cart_get_item_data/choice', function( $choice_data, $layer ) {
	$parent_id = $layer->get_choice( 'parent' );
	if ( $parent_id && is_callable( [ $layer, 'get_choice_by_id' ] ) ) {
		$parent = $layer->get_choice_by_id( $parent_id );
		if ( $parent && isset( $parent[ 'name' ] ) ) {
			$choice_data['value'] =  $parent[ 'name' ] . ', ' . $choice_data['value'];
		}
	}
	return $choice_data;
}, 20, 2 );

// Filter the data in the order
add_filter( 'mkl_pc/order_created/save_layer_meta', function( $choice_data, $layer ) {
	$parent_id = $layer->get_choice( 'parent' );
	if ( $parent_id && is_callable( [ $layer, 'get_choice_by_id' ] ) ) {
		$parent = $layer->get_choice_by_id( $parent_id );
		if ( $parent && isset( $parent[ 'name' ] ) ) {
			$choice_data['value'] =  $parent[ 'name' ] . ', ' . $choice_data['value'];
		}
	}
	return $choice_data;
}, 20, 2 );