Step 1 Adding a Plugin

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function my_admin_menu() {
    $page_title = 'Clear Stock';
    $menu_title = 'Clear Stock';
    $capability = 'manage_options';
    $menu_slug = '/clear_stock';
    $function = 'clear_stock';
    $icon_url = '';
    $position = -1;
    add_menu_page( $page_title, $menu_title, $capability, $menu_slug, $function, $icon_url, $position);
}
add_action( 'admin_menu', 'my_admin_menu' );