Navigation Parent Items in Clusters

use App\Filament\Clusters\ContentManagementSystem;
use Filament\Pages\Page;

class Tester extends Page
{
    protected static ?string $navigationIcon = 'heroicon-o-document-text';

    protected static ?string $cluster = ContentManagementSystem::class;

    protected static ?string $navigationGroup = 'HOMEPAGE CONTROLS';

    protected static string $view = 'filament.clusters.content-management-system.pages.controls.tester';
}

class TesterResource extends Resource
{
    protected static ?string $model = Tester::class;

    protected static ?string $navigationIcon = 'heroicon-o-rectangle-stack';

    protected static ?string $navigationGroup = 'HOMEPAGE CONTROLS';

    protected static ?string $cluster = ContentManagementSystem::class;

    public static function getNavigationParentItem(): ?string
    {
        return __('filament.clusters.content-management-system.pages.homepage-controls.tester');
    }
...