<?php add_action('customize_register','nd_options_customizer_post'); function nd_options_customizer_post( $wp_customize ) { //ADD panel $wp_customize->add_panel( 'nd_options_customizer_post', array( 'title' => __( 'Post Template', 'nd-shortcodes' ), 'capability' => 'edit_theme_options', 'theme_supports' => '', 'description' => __( 'Post Template Settings', 'nd-shortcodes' ), // html tags such as <p>. 'priority' => 230, // Mixed with top-level-section hierarchy. ) ); //ADD section 1 $wp_customize->add_section( 'nd_options_customizer_post_layout_section' , array( 'title' => 'Layout', 'priority' => 10, 'panel' => 'nd_options_customizer_post', ) ); //styles $wp_customize->add_setting( 'nd_options_customizer_post_layout', array( 'type' => 'option', // or 'option' 'capability' => 'edit_theme_options', 'theme_supports' => '', // Rarely needed. 'default' => '', 'transport' => 'refresh', // or postMessage 'sanitize_callback' => '', 'sanitize_js_callback' => '', // Basically to_json. ) ); $wp_customize->add_control( 'nd_options_customizer_post_layout', array( 'label' => __( 'Select Layout' ), 'type' => 'select', 'section' => 'nd_options_customizer_post_layout_section', 'choices' => array( 'layout-1' => 'Layout 1', 'layout-2' => 'Layout 2', 'layout-3' => 'Layout 3', 'layout-4' => 'Layout 4', 'layout-5' => 'Layout 5', 'layout-6' => 'Layout 6', 'layout-7' => 'Layout 7', 'layout-8' => 'Layout 8', 'layout-9' => 'Layout 9', ), ) ); }