Cart Transform

Merge cart items into a bundle line, or change an item’s title, image and price.

Cart Transform changes how items look in the cart and at checkout. Open it with Create on the Home page’s More Functions card and choose Cart Transform. The Cart Transform tab on the Manage page lists every operation you have built and which are active.

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First-time setup

The first time you open it, click Set up Cart Transform. This registers the function with Shopify and switches it on. Nothing changes at checkout until you add an operation.

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Operations

All operations live in one function. Click Add new and choose a type:

Operation	What it does	Plan
Merge items	Groups several cart items into a single bundle line	Any Shopify plan
Update line item	Changes a line’s title, image and price at checkout	Shopify Plus

Each operation has an optional Operation name (not shown to customers), an Operation status, and the same customer and cart qualifiers as campaigns. The row menu has Edit, Duplicate, Move up, Move down and Delete.

A saved operation keeps its type. To change it, add a new operation instead.

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Merge items

Field	What it does
Bundle Parent Product	The product that represents the bundle in the cart
Items to Merge	The products combined into the bundle, each with the quantity needed. A merge needs at least two items
Bundle Title	The title shown for the merged line in the cart
Discount on the bundle (%)	A percentage off the bundle. Leave empty to charge the sum of the item prices
Properties	Optional key-value properties added to the merged line, for example _bundle_title

Shopify reduces a merged line by a percentage only; there is no fixed bundle price.

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Update line item

Choose which lines to change with Match lines by: a Selector (product, collection, SKU and more) or Specific variants. Then set the update:

Field	What it does
New title	Replaces the line’s title. Leave empty to keep it
Image	Pick a file from your store’s Content > Files, or paste a Shopify-hosted image URL. Shown in checkout only
New price each	A fixed price per unit

Fill in at least one of the three. Use Market scope to apply the update in All markets, or add Market-specific updates for particular markets.

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Cart Transform or Bundle Discount?

	Cart Transform (merge)	Bundle Discount
Cart shows	One combined bundle line	The separate items the shopper added
Best for	Selling a bundle as one product	Rewarding shoppers for buying a combination

Shopify allows one cart transform per app per store, and its configuration is limited to 10 kB. If you go over, the page shows Over the configuration limit: remove an operation, or simplify the qualifiers on one.