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.
Required: WooCommerce Checkout Add-Ons is a premium WooCommerce extension included with WordPress Ecommerce Hosting or as a standalone purchase.
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Go to Appearance > Customize.
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Select WooCommerce > Checkout.
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Select the desired display setting from the Checkout Add-Ons display menu.


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Select how you would like to Calculate add-on percentage-based prices.
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Click Publish.