I think I know what you're looking for, but it would be much better if you post an example code to eliminate any miscommunication.

Guess it depends on your site, what defines a customer? If you have an ecommerce site, is someone that created an account? If so you wouldn't even need to create a customer, because all of your users are potential customers. The users table could have a one-to-many relationship with an orders table. Just one option. You could inject the order repository into your controller:

public function __construct(OrderRepositoryInterface $order)
{
    $this->order = $order;
}

public function store()
{
    $this->order->create(Auth::user()->id, Input::all());
}