1.app/code/core/Mage/Adminhtml/Block/Catalog/Product/Edit/Tab/Options/Option.php
<global>
<blocks>
<adminhtml>
<rewrite>
<catalog_product_edit_tab_options_option>Spacename_Modulename_Block_Adminhtml_Catalog_Product_Edit_Tab_Options_Option</catalog_product_edit_tab_options_option>
</rewrite>
</adminhtml>
</blocks>
</global>
2.app/design/adminhtml/default/default/template/catalog/product/edit/options/option.phtml
class Spacename_Modulename_Block_Adminhtml_Catalog_Product_Edit_Tab_Options_Option extends Mage_Adminhtml_Block_Catalog_Product_Edit_Tab_Options
{
public function __construct()
{
parent::__construct();
$this->setTemplate('test/yours.phtml'); // add you phtml file here
}
}
same goes for point 4.
override Block
Mage_Adminhtml_Block_Catalog_Product_Edit_Tab_Options_Type_Select
and set template in
__construct
3 point Changing the product custom option renderer