If your add-on field doesn’t have a price assigned to it, you can opt to hide the pricing information in the cart and at checkout.
Just go to WooCommerce > Settings > Product Add-Ons and select ‘Hide zero prices’:
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- WooCommerce Product Add-Ons Ultimate
- Hide zero prices
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- Cart
- Hide zero prices
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- Pricing
- Hide zero prices
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- Front End
- Hide zero prices