If an order is placed how to get the partial amount in Magento?

I’ve produced a hyperlink with Magento admin to produce the invoice for separate item, But whenever I call the function $order->prepareInvoice($qtys) it’ll add

all of the items in invoice even I’m passing just one product.

I’m using the following code:

$order = Mage::getModel(‘sales/order’)->load($this->getRequest()->getParam(‘order_id’));

$count = $order->getTotalItemCount();

$qtys = Array
    (
        [370] => 1
    );

$invoice = $order->prepareInvoice($qtys);
if (!$invoice->getTotalQty()) {
    Mage::throwException(Mage::helper(‘core’)->__(‘Cannot create an invoice without products.’));
}

$amount = $invoice->getGrandTotal();
$invoice->register()->pay();
$invoice->getOrder()->setIsInProcess(true);
$history = $invoice->getOrder()->addStatusHistoryComment(‘Partial amount of $’. $amount .’ captured automatically.’, false);
$history->setIsCustomerNotified(true);
$order->save();
Mage::getModel(‘core/resource_transaction’)
            ->addObject($invoice)
            ->addObject($invoice->getOrder())
            ->save();
$invoice->save();

I would appreciate any suggestions.

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