Remove subcategory in Laravel 5.8

I am beginner in Laravel. I use in my project Laravel 5.8.

I have this code:

Model:

class ProductsCategory extends Model
{
    protected $quarded = [];
    protected $fillable = ['company_id', 'enable', 'name', 'url_address', 'level', 'parent_id', 'number'];
    public $timestamps = true;
    protected $table = 'products_category';
}

Migration:

public function up()
    {
        Schema::create('products_category', function (Blueprint $table) {
            $table->bigIncrements('id');
            $table->bigInteger('company_id')->unsigned();
            $table->foreign('company_id')->references('id')->on('companies')->onDelete('cascade');
            $table->char('enable', 1)->default(0);
            $table->string('name', 85)->nullable();
            $table->string('url_address', 160);
            $table->integer('level')->default(0);
            $table->bigInteger('parent_id')->default(0);
            $table->bigInteger('number')->default(0);
            $table->timestamps();
            $table->engine = "InnoDB";
            $table->charset = 'utf8mb4';
            $table->collation = 'utf8mb4_unicode_ci';
        });
    }

I have many categories and subcategories in the database. Subcategories and categories are connected by parent_id.

How can I delete a record in such a way that all its subcategories are removed?

via Chebli Mohamed