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The quantity is associated to Mage_Cataloginventory
If you know the item sku, you can update the qty as following:
$productId = $product->getIdBySku($sku);
$stockItem = Mage::getModel('cataloginventory/stock_item');
$stockItem->loadByProduct($productId);
$stockItem->setQty($quantity);
$stockItem->save();
Or you can use alternative way to update quantity.
$product = Mage::getModel('catalog/product');
$product->load($productId);
$product->setStockData(array('qty'=>$quantity));
$product->save();
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Sales: Call 877.832.5289 (N America)|310.295.4144 (International)
