Put below codes in your functions.php
function sorcey_customize_register($wp_customize){
$wp_customize->add_section('sorcey_footer', array(
'title' => __('New Section', 'text_domain'),
'description' => '',
'priority' => 120,
));
/* =============================
Text input
===============================*/
$wp_customize->add_setting("sr_copyright", array(
"default" => "",
'capability' => 'edit_theme_options',
"transport" => "postMessage",
));
$wp_customize->add_control(new WP_Customize_Control($wp_customize, "sr_copyright_ctrl",
array(
"label" => __("Title", "text_domain"),
"section" => "sorcey_footer",
"settings" => "sr_copyright",
"type" => "text",
)
));
}
add_action('customize_register', 'sorcey_customize_register');
Then chek there will be a ‘New Section’