Copying files to the local code pool will only work for blocks, helpers and models. You cannot override controllers using this method since they are not autoloaded like the other classes.
So the only way to do it is via custom module. You will need following definition in your config.xml
<admin>
<routers>
<adminhtml>
<args>
<modules>
<Foo_Bar before="Mage_Adminhtml">Foo_Bar_Adminhtml</Foo_Bar>
</modules>
</args>
</adminhtml>
</routers>
</admin>And in your controller class you need to add this:
require_once Mage::getModuleDir('controllers', 'Mage_Adminhtml') . DS . 'Catalog' . DS . 'CategoryController.php';
class Foo_Bar_Adminhtml_IndexController extends Mage_Adminhtml_Catalog_CategoryController
{Your controller class should be in local/Foo/Bar/controllers/Adminhtml/Catalog/CategoryController.php
It should be straightforward, let me know if you face any issue.
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