Add all files

app/Admin/Resources/ServiceResource/RelationManagers/InvoicesRelationManager.php

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+<?php
+
+namespace App\Admin\Resources\ServiceResource\RelationManagers;
+
+use App\Admin\Resources\InvoiceResource;
+use App\Models\Invoice;
+use App\Models\InvoiceItem;
+use Filament\Forms;
+use Filament\Forms\Form;
+use Filament\Resources\RelationManagers\RelationManager;
+use Filament\Tables;
+use Filament\Tables\Table;
+use Illuminate\Database\Eloquent\Builder;
+use Illuminate\Database\Eloquent\Relations\Relation;
+
+class InvoicesRelationManager extends RelationManager
+{
+    protected static string $relationship = 'invoices';
+
+    // Edit query
+    protected function getTableQuery(): Builder|Relation|null
+    {
+        return Invoice::query()->whereIn('id', InvoiceItem::query()
+            ->where(function ($query) {
+                $query->where('reference_type', 'App\Models\Service')
+                    ->where('reference_id', $this->ownerRecord->id);
+            })->orWhere(function ($query) {
+                $query->where('reference_type', 'App\Models\ServiceUpgrade')
+                    ->whereIn('reference_id', $this->ownerRecord->upgrade()->pluck('id')->filter());
+            })->pluck('invoice_id'));
+    }
+
+    public function form(Form $form): Form
+    {
+        return $form
+            ->schema([
+                Forms\Components\TextInput::make('id')
+                    ->required()
+                    ->maxLength(255),
+
+            ]);
+    }
+
+    public function table(Table $table): Table
+    {
+        return $table
+            ->recordTitleAttribute('id')
+            ->columns([
+                Tables\Columns\TextColumn::make('id')->sortable(),
+                Tables\Columns\TextColumn::make('formattedTotal')->label('Total'),
+                Tables\Columns\TextColumn::make('status')
+                    ->label('Status')
+                    // Make first letter uppercase
+                    ->formatStateUsing(fn (string $state): string => ucfirst($state))
+                    ->badge()
+                    ->color(fn (string $state): string => match ($state) {
+                        'paid' => 'success',
+                        'pending' => 'warning',
+                        default => 'danger',
+                    }),
+            ])
+            ->filters([
+                //
+            ])
+            ->headerActions([])
+            ->actions([
+                Tables\Actions\ViewAction::make()->url(fn ($record) => InvoiceResource::getUrl('edit', ['record' => $record])),
+            ])
+            ->defaultSort('invoices.id', 'desc');
+    }
+}