Add all files

app/Admin/Resources/OrderResource/Pages/CreateOrder.php

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+<?php
+
+namespace App\Admin\Resources\OrderResource\Pages;
+
+use App\Admin\Resources\OrderResource;
+use App\Models\Invoice;
+use Filament\Resources\Pages\CreateRecord;
+
+class CreateOrder extends CreateRecord
+{
+    protected static string $resource = OrderResource::class;
+
+    protected function afterCreate(): void
+    {
+        $invoice = new Invoice([
+            'user_id' => $this->record->user_id,
+            'currency_code' => $this->record->currency_code,
+            'due_at' => now()->addDays(7),
+        ]);
+        $invoice->save();
+
+        foreach ($this->record->services as $service) {
+            $invoice->items()->create([
+                'description' => $service->description,
+                'price' => $service->price,
+                'quantity' => $service->quantity,
+                'reference_id' => $service->id,
+                'reference_type' => get_class($service),
+            ]);
+        }
+
+    }
+}

app/Admin/Resources/OrderResource/Pages/EditOrder.php

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+<?php
+
+namespace App\Admin\Resources\OrderResource\Pages;
+
+use App\Admin\Resources\OrderResource;
+use Filament\Actions;
+use Filament\Resources\Pages\EditRecord;
+
+class EditOrder extends EditRecord
+{
+    protected static string $resource = OrderResource::class;
+
+    protected function getHeaderActions(): array
+    {
+        return [
+            Actions\DeleteAction::make(),
+        ];
+    }
+}

app/Admin/Resources/OrderResource/Pages/ListOrders.php

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+<?php
+
+namespace App\Admin\Resources\OrderResource\Pages;
+
+use App\Admin\Resources\OrderResource;
+use Filament\Actions;
+use Filament\Resources\Pages\ListRecords;
+
+class ListOrders extends ListRecords
+{
+    protected static string $resource = OrderResource::class;
+
+    protected function getHeaderActions(): array
+    {
+        return [
+            Actions\CreateAction::make(),
+        ];
+    }
+}

app/Admin/Resources/OrderResource/RelationManagers/ServiceRelationManager.php

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+<?php
+
+namespace App\Admin\Resources\OrderResource\RelationManagers;
+
+use App\Admin\Resources\ServiceResource;
+use Filament\Resources\RelationManagers\RelationManager;
+use Filament\Tables;
+use Filament\Tables\Table;
+
+class ServiceRelationManager extends RelationManager
+{
+    protected static string $relationship = 'services';
+
+    // Renaem to Order Products
+    public static string $name = 'Products/Services';
+
+    public static ?string $label = 'Products/Services';
+
+    public function table(Table $table): Table
+    {
+        return $table
+            ->recordTitleAttribute('product.name')
+            ->columns([
+                Tables\Columns\TextColumn::make('product.name'),
+                Tables\Columns\TextColumn::make('quantity'),
+                Tables\Columns\TextColumn::make('formattedPrice')->label('Price'),
+            ])
+            ->filters([
+                //
+            ])
+            ->actions([
+                Tables\Actions\ViewAction::make()->url(fn ($record) => ServiceResource::getUrl('edit', ['record' => $record])),
+            ])
+            ->bulkActions([
+                Tables\Actions\BulkActionGroup::make([
+                    Tables\Actions\DeleteBulkAction::make(),
+                ]),
+            ]);
+    }
+}