Hi Dave,

Add the following code at the end of functions.php file to remove the slugs from your portfolio:

/**
 * Remove the slug from published post permalinks.
 */
function laborator_remove_portfolio_prefix_from_link( $post_link, $post, $leavename ) {

    if ( 'portfolio' != $post->post_type || 'publish' != $post->post_status ) {
        return $post_link;
    }

    $post_link = str_replace( '/' . $post->post_type . '/', '/', $post_link );

    return $post_link;
}
add_filter( 'post_type_link', 'laborator_remove_portfolio_prefix_from_link', 10, 3 );

/**
 * Some hackery to have WordPress match postname to any of our public post types
 */
function laborator_get_portfolio_item_without_post_archive_prefix( $query ) {

    // Only noop the main query
    if ( ! $query->is_main_query() )
        return;

    // Only noop our very specific rewrite rule match
    if ( 2 != count( $query->query ) || ! isset( $query->query['page'] ) ) {
        return;
    }

    // 'name' will be set if post permalinks are just post_name, otherwise the page rule will match
    if ( ! empty( $query->query['name'] ) ) {
        $query->set( 'post_type', array( 'post', 'portfolio', 'page' ) );
    }
}
add_action( 'pre_get_posts', 'laborator_get_portfolio_item_without_post_archive_prefix' );

You're welcome