Magento – Bulk edit of up-sell / cross-sell product items

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Install below extension that will help you to create extra page after cart

https://github.com/tmhub/suggestpage

above extension add extra page after cart and that page you will add these code and you will get cross-sell product data

change your indexController indexAction as below

public function indexAction()
{
    $this->loadLayout()
        ->_initLayoutMessages('checkout/session')
        ->_initLayoutMessages('catalog/session');

    $_product = Mage::getModel('catalog/product')->load(1); //here 1 is product Id
    $block =  $this->getLayout()->createBlock('checkout/cart_crosssell')->setProduct($_product)->setTemplate('checkout/cart/crosssell.phtml');
    $this->getLayout()->getBlock('content')->append($block);

    $this->renderLayout();
}

and for your 4 product issue please check in your app/design/frontend/YourPackge/YourTheme/checkout/cart/crosssell.phtml file any condition who breaks for loop after four product then change it.

to increase limit for cross-sell product follow this quick step

1) copy app/code/core/Mage/Checkout/Block/Cart/Crosssell.php file to app/code/local/Mage/Checkout/Block/Cart/Crosssell.php

2) find this line and increase limit as per your need protected $_maxItemCount = 4;