Combine Add-on to main items in Cart and Checkout page
Imagine you're selling Christmas Stocking with Personalizable name that can be embroidered and other extra services, including:
Main product price is $19.99
Add-on price for custom name: $10
Add-on price for extra services ($10 for gift wrapping and $10 express delivery)
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Once a customer selected some options with add-on price then add the product to cart. With the original add-on price method -> The add-on items and main item will be display as separated items in cart and checkout page. Like this:
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We are thrilled to unveil a highly requested feature that many of our users have been waiting for - Combined Add-on! This powerful addition gives you, the Shopify merchant, the ability to stack the add-on items to the main product, reduce the quantity of add-on items displayed in the cart.
Using this feature, the add-on items and related main item will be combined into 1 item in cart and checkout page.
From the example we mentioned above:
All add-on items price will be calculated to the main item price ($19.99 + $10 +$10 + $10 = $49.99)
All add-on items will also be combined to the main related item into only one item in cart and checkout page.
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1. Create an Option Set
- Go to the Option set page and click on the Create option set button.
- In the option set editor, select your preferred option type: Single input, Single selection, or Multiple selections.
Learn more about creating option sets here.
2. Setting Up the Add-On Prices as you wish
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3. Apply the Option Set to Products
- Click on the Select products button and choose the products to which this option set will be applied.
Learn more about applying option sets to products here.
- Click Apply and Create to activate the option set.
4. Turn on Settings for Combine add-on to main item
- Navigate to Settings > Add-on Price section and enable the Combine add-on items to main item on Cart and Checkout page checkbox
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⚠️ Please note that this function does not work with Editing option in cart
5. Save settings and test on Storefront
- With the feature enabled, it's essential to thoroughly test it. You can place a test order with the add-on option and several main products to ensure the correct function.
Learn more about creating a test order on Shopify here.
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Additional Notes
- The feature does not yet work with Editing options in cart at the moment, unfortunately.
Hopefully this instruction has helped you. You can either email us at support@tepo.app or utilize the in-app live chat. We are always here to assist you and provide any necessary assistance. We're committed to ensuring your satisfaction with our service 🤩
Main product price is $19.99
Add-on price for custom name: $10
Add-on price for extra services ($10 for gift wrapping and $10 express delivery)

Once a customer selected some options with add-on price then add the product to cart. With the original add-on price method -> The add-on items and main item will be display as separated items in cart and checkout page. Like this:


🔉 Introducing the Combined Add-on and Main items in Cart and Checkout page!
We are thrilled to unveil a highly requested feature that many of our users have been waiting for - Combined Add-on! This powerful addition gives you, the Shopify merchant, the ability to stack the add-on items to the main product, reduce the quantity of add-on items displayed in the cart.
Using this feature, the add-on items and related main item will be combined into 1 item in cart and checkout page.
From the example we mentioned above:
All add-on items price will be calculated to the main item price ($19.99 + $10 +$10 + $10 = $49.99)
All add-on items will also be combined to the main related item into only one item in cart and checkout page.

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How to Set up?
1. Create an Option Set
- Go to the Option set page and click on the Create option set button.
- In the option set editor, select your preferred option type: Single input, Single selection, or Multiple selections.
Learn more about creating option sets here.
2. Setting Up the Add-On Prices as you wish
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3. Apply the Option Set to Products
- Click on the Select products button and choose the products to which this option set will be applied.
Learn more about applying option sets to products here.
- Click Apply and Create to activate the option set.
4. Turn on Settings for Combine add-on to main item
- Navigate to Settings > Add-on Price section and enable the Combine add-on items to main item on Cart and Checkout page checkbox
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⚠️ Please note that this function does not work with Editing option in cart
5. Save settings and test on Storefront
- With the feature enabled, it's essential to thoroughly test it. You can place a test order with the add-on option and several main products to ensure the correct function.
Learn more about creating a test order on Shopify here.
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Additional Notes
- The feature does not yet work with Editing options in cart at the moment, unfortunately.
Hopefully this instruction has helped you. You can either email us at support@tepo.app or utilize the in-app live chat. We are always here to assist you and provide any necessary assistance. We're committed to ensuring your satisfaction with our service 🤩
Updated on: 20/02/2025
Thank you!