product tier price addupdate magento

you can use some PHP code that uses the Magento code to query for a list of products that match those criteria and then adjust each one
 

<?php
require 'app/Mage.php';
$app = Mage::app('default'); // Mage_Core_Model_App
$store = $app->getStore(); // Mage_Core_Model_Store
$products = Mage::getModel('catalog/product')->getCollection();
// filter out anything that doesnt match the customer group 4
$products->addFieldToFilter('customer_group', '4');
// loop through each product and delete it
for ($products->load() as $product) {
  $product->delete();
}

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