Set up Checkout Add-ons
You can decide where your add-on fields will appear on the checkout page – before or after the billing details section or before the order summary (default) – by adjusting the display setting.
- Log in to WordPress.
- Go to Appearance > Customize.
- Select WooCommerce > Checkout.
- Select the desired display setting from the Checkout Add-Ons display menu.
- Select how you would like to Calculate add-on percentage-based prices.
- Click Publish.