CSS- Bunları nasıl birleştirebilirim

// base.css file
    wp_register_style( 'tie-css-base', TIELABS_TEMPLATE_URL . '/assets/css/base'. $min .'.css', array(), $ver );

    // Main style.css file
    wp_register_style( 'tie-css-styles', TIELABS_TEMPLATE_URL . '/assets/css/style'. $min .'.css', array(), $ver );

    // Single Post CSS file
    wp_register_style( 'tie-css-single', TIELABS_TEMPLATE_URL . '/assets/css/single'. $min .'.css', array(), $ver );

    // Widgets
    wp_register_style( 'tie-css-widgets', TIELABS_TEMPLATE_URL . '/assets/css/widgets'. $min .'.css', array(), $ver );

    // Widgets
    wp_register_style( 'tie-css-helpers', TIELABS_TEMPLATE_URL . '/assets/css/helpers'. $min .'.css', array(), $ver );

    // Font Awesome 5.0
    wp_register_style( 'tie-fontawesome5', TIELABS_TEMPLATE_URL . '/assets/css/fontawesome.css', array(), $ver );

    // Print
    wp_register_style( 'tie-css-print', TIELABS_TEMPLATE_URL . '/assets/css/print.css', array(), $ver, 'print' );

    // LightBox
    wp_register_style( 'tie-css-ilightbox', TIELABS_TEMPLATE_URL . '/assets/ilightbox/'. tie_get_option( 'lightbox_skin', 'dark' ) .'-skin/skin.css', array(), $ver );

@import     url("navigation.css");