Add all files

app/Admin/Resources/Common/RelationManagers/PropertiesRelationManager.php

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+<?php
+
+namespace App\Admin\Resources\Common\RelationManagers;
+
+use App\Models\CustomProperty;
+use Filament\Forms;
+use Filament\Forms\Form;
+use Filament\Resources\RelationManagers\RelationManager;
+use Filament\Tables;
+use Filament\Tables\Table;
+
+class PropertiesRelationManager extends RelationManager
+{
+    protected static string $relationship = 'properties';
+
+    public function form(Form $form): Form
+    {
+        return $form
+            ->schema([
+                Forms\Components\Select::make('custom_property_id')->label('Custom Property')
+                    ->required()
+                    ->options(function ($livewire): array {
+                        return CustomProperty::where('model', get_class($livewire->ownerRecord))->pluck('name', 'id')->toArray();
+                    })->nullable(),
+                Forms\Components\TextInput::make('name')->translateLabel()->nullable(),
+                Forms\Components\TextInput::make('key')->translateLabel()->required(),
+                Forms\Components\TextInput::make('value')->translateLabel()->required(),
+            ]);
+    }
+
+    public function table(Table $table): Table
+    {
+        return $table
+            ->recordTitleAttribute('name')
+            ->columns([
+                Tables\Columns\TextColumn::make('name'),
+                Tables\Columns\TextColumn::make('parent_property.name'),
+                Tables\Columns\TextColumn::make('key'),
+                Tables\Columns\TextInputColumn::make('value'),
+            ])
+            ->filters([
+                //
+            ])
+            ->headerActions([
+                Tables\Actions\CreateAction::make(),
+            ])
+            ->actions([
+                Tables\Actions\EditAction::make(),
+                Tables\Actions\DeleteAction::make(),
+            ])
+            ->bulkActions([
+                Tables\Actions\BulkActionGroup::make([
+                    Tables\Actions\DeleteBulkAction::make(),
+                ]),
+            ]);
+    }
+}