Creating a custom settings tab in WooCommerce involves a bit of PHP coding, as WooCommerce provides hooks and functions for extending its settings. Below is a basic outline of the steps you can follow to create a custom settings tab:

Step 1: Set up your WordPress plugin

Create a new directory for your plugin:
In your WordPress plugins directory (usually wp-content/plugins/), create a new directory for your plugin.
Create the main plugin file:
Inside your plugin directory, create a main PHP file (e.g., custom-woocommerce-tab.php).
Add plugin header:
In your main plugin file, start with the plugin header, including the plugin name, description, and other details.

   /*
   Plugin Name: Custom WooCommerce Tab
   Description: Add a custom settings tab in WooCommerce.
   Version: 1.0
   Author: Your Name
   */

   // Your code will go here

Step 2: Creating a class

/**
 * Custom WooCommerce Tab Class
 */
class Wooprint_Wc_Settings {


}

// Instantiate the class
new Wooprint_Wc_Settings();

In this class-based example:

The class is instantiated at the end, which automatically sets up the hooks and initializes the functionality.

This class encapsulates the functionality related to your custom WooCommerce tab, providing a more structured and organized way to handle your code.

Step 3: Add the custom settings tab

/**
 * Custom WooCommerce Tab Class
 */
class Wooprint_Wc_Settings {
        /**
         * string tab id;
         */
        public $tab_id;

        /**
         * Run all the actions and filter here.
         */
        public function __construct() {
            $this->tab_id = 'wooprint_tab';
            add_filter( 'woocommerce_settings_tabs_array', array( $this, 'wooprint_add_new_tab' ), 50 );
        }

                /**
         * Add a new tab to the WooCommerce settings tabs array
         *
         * @param array $tabs all tabs.
         * @return array
         */
        public function wooprint_add_new_tab( $tabs ) {
            $tabs[ $this->tab_id ] = __( 'Wooprint Tab', 'wooprint' );
            return $tabs;
        }

}

// Instantiate the class
new Wooprint_Wc_Settings();

Step 4: Add the custom section inside the custom settings tab

/**
 * Custom WooCommerce Tab Class
 */
class Wooprint_Wc_Settings {
        /**
         * string tab id;
         */
        public $tab_id;

        /**
         * Run all the actions and filter here.
         */
        public function __construct() {
            $this->tab_id = 'wooprint_tab';
            add_filter( 'woocommerce_settings_tabs_array', array( $this, 'wooprint_add_new_tab' ), 50 );
            add_action( 'woocommerce_sections_' . $this->tab_id, array( $this, 'wooprint_add_new_section' ) );
        }

        /**
         * Add a new tab to the WooCommerce settings tabs array
         *
         * @param array $tabs
         * @return array
         */
        public function add_wooprint_tab( $tabs ) {
            $tabs[ $this->tab_id ] = __( 'Wooprint Tab', 'wooprint' );
            return $tabs;
        }

        /**
         * Add new section inside tab.
         *
         * @return void
         */
        public function wooprint_add_new_section() {
            global $current_section;

            $sections      = array(
                ''                 => __( 'General Settings', 'wooprint' ),
                'invoice_settings' => __( 'Invoice Settings', 'wooprint' ),
            );
            $sections_keys = array_keys( $sections );

            echo '<ul class="subsubsub">';

            foreach ( $sections as $id => $label ) {
                $url = add_query_arg(
                    array(
                        'page'    => 'wc-settings',
                        'tab'     => $this->tab_id,
                        'section' => $id,
                    ),
                    admin_url( 'admin.php' )
                );

                $current = $current_section === $id ? 'current' : '';

                $separator = end( $sections_keys ) === $id ? '' : '|';

                echo '<li><a href="' . esc_url( $url ) . '" class="' . esc_html( $current ) . '">' . esc_attr( $label ) . '</a> ' . esc_attr( $separator ) . ' </li>';
            }

            echo '</ul><br class="clear" />';
        }

}

// Instantiate the class
new Wooprint_Wc_Settings();

Step final: Test your custom tab

Go to WooCommerce > Settings, and you should see your custom tab. You can then configure and save your custom settings.

Note: This is a basic example, and you may need to enhance it based on your specific needs. You can refer to the WooCommerce documentation for more details on available hooks and functions.

how to create a custom setting tab in WooCommerce?