Hi,
If you OK with doing some hacks, this may help you.
NOTE: these hacks may crash your website. So, please CREATE A BACKUP of your site and TRY THE HACKS ON A LOCAL COPY of your website before uploading changes to your "live" server.
1. Use PHPMyAdmin or the MySQL console and search the xc_categories table for the category where you want to move other categories into. Remember its id.
2. In the xc_categories table, update categories which you want to move and set their parent_id to the id of the category from the 1st step.
3. Create and run (from the SSH console, or from your browser) the following script from the directory where X-Cart is installed:
Code:
<?php
require_once (dirname(__FILE__) . DIRECTORY_SEPARATOR . 'top.inc.php');
\XLite\Core\Database::getRepo('XLite\Model\Category')->correctCategoriesStructure();