wc-settings-section-sample.php

<?php
// This is just a form sample

// Add a new section to WooCommerce > Settings > Products
function add_my_products_section( $sections ) {
	$sections['tshirt_designer'] = __( 'T-Shirt Designer', 'my-textdomain' );
	return $sections;
}
add_filter( 'woocommerce_get_sections_products', 'add_my_products_section' );


// Add Settings for new section
function add_my_products_settings( $settings, $current_section ) {

	// make sure we're looking only at our section
	if ( 'tshirt_designer' === $current_section ) {
		
		$my_settings = array(
			array(
				'title'     => __( 'My Settings Section', 'my-textdomain' ),
					'type'      => 'title',
					'id'        => 'my_settings_section',
			),
			
			array(
				'id'       => 'my_settings_radio',
				'type'     => 'radio',
				'title'    => __( 'A Radio input', 'my-textdomain' ),
				'options'  => array(
					'uno'  => __( 'The first option', 'my-textdomain' ),
					'dos' => __( 'The second option', 'my-textdomain' ),
				),
				'default'  => 'uno',
				'desc'     => __( 'What this radio does.', 'my-textdomain' ),
				'desc_tip' => true,
			),

			array(
				'type'  => 'sectionend',
				'id'    => 'my_settings_section',
			),
		);
		
		return $my_settings;
		
	} else {
		// otherwise give us back the other settings
		return $settings;
	}
}
add_filter( 'woocommerce_get_settings_products', 'add_my_products_settings', 10, 2 );