Guide
1
Create a new customization
Create a new customization.

2
Select the Cart Item Details category
Choose Cart Item Details as the customization category.

3
Choose the Adjust Quantity type
Select Adjust Quantity from the available Cart Item Details options to allow customers to update product quantities directly during checkout.

4
Choose a placement
Select Render After Each Cart Item from the available placement options.

5
Configure display conditions
Add one or more conditions to control when the quantity selector is displayed during checkout.

6
Configure Quantity Selector settings
Configure the Quantity Selector settings, including the Link Title displayed for each cart item.

7
Activate the customization
Change the Status to Active to enable the customization.

8
Set the priority
Configure the Priority (0–100) to determine the execution order when multiple customizations are eligible.

9
Copy the Placement ID
Open the Placement tab and copy the generated Placement ID. You’ll use this in the Shopify Checkout Editor.

10
Save the customization
Click Save to store your configuration.

11
Open the Checkout Editor
Go to your Shopify Settings → Checkout, select your checkout profile, and click Customize.

12
Add the app block
In the Checkout Editor, click Add app block.

Make sure the app block is placed in the same checkout placement you selected in Dynamic Checkout Customizer.
13
Configure the app block
Select the Checkout – Image Content app block, drag it to the desired location, and paste the copied Placement ID.

14
Publish your changes
Click Save in the Checkout Editor to publish the customization.

Why does it matter?The Cart Item Details → Adjust Quantity customization lets customers update product quantities directly during checkout, reducing friction and making it easier to increase order quantities without returning to the cart. This can help improve average order value (AOV).
