Meta Box

Hello wizible, you can simply change the 'Custom rewrite slug' in the advanced tab of a metabox custom post type.
(It works with polylang pro). They will appear in translation sub menu.
Hope it helps!

I aked chatgpt to add that feature into wordpress. I don't know if it can works. Gotta try it now.

<?php
/*
Plugin Name: Metabox Relationships Export/Import
Description: Export and import Metabox Relationships data in JSON format.
Version: 1.0
Author: Your Name
*/

// Export Metabox Relationships data as JSON
function export_metabox_relationships_as_json() {
    global $wpdb;

    // ... (same export code as before) ...

    // Output the JSON for download
    header('Content-disposition: attachment; filename=metabox_relationships_export.json');
    header('Content-type: application/json');
    echo $json_data;
    exit;
}

// Import Metabox Relationships data from JSON
function import_metabox_relationships_from_json() {
    if (isset($_FILES['metabox_relationships_json'])) {
        $json_data = file_get_contents($_FILES['metabox_relationships_json']['tmp_name']);

        // Decode JSON data
        $import_data = json_decode($json_data, true);

        if ($import_data) {
            // Process and import relationships data here
            // ... (import code) ...
            // Ensure data validation and use Metabox Relationships API to import
        } else {
            // Handle JSON decoding error
            echo "Invalid JSON data!";
        }
    }
}

// Create admin menu items for export/import
function add_metabox_relationships_menu() {
    add_menu_page(
        'Metabox Relationships Export',
        'Metabox Relationships',
        'manage_options',
        'metabox-relationships-export',
        'export_metabox_relationships_as_json'
    );

    add_submenu_page(
        'metabox-relationships-export',
        'Import Metabox Relationships',
        'Import',
        'manage_options',
        'metabox-relationships-import',
        'import_metabox_relationships_page'
    );
}

// HTML for import page
function import_metabox_relationships_page() {
    ?>
    <div class="wrap">
        <h1>Import Metabox Relationships</h1>
        <form method="post" enctype="multipart/form-data">
            <input type="file" name="metabox_relationships_json">
            <?php submit_button('Import Relationships'); ?>
        </form>
    </div>
    <?php
}

// Hook functions to admin menu and actions
add_action('admin_menu', 'add_metabox_relationships_menu');
add_action('admin_post_import_metabox_relationships', 'import_metabox_relationships_from_json');