Guide
1
Create a new customization
Create a new customization.

2
Select Add Notes from Cart Item Details category
Choose Add tags as the customization from available types of Cart Item Detail.

3
Configure conditions
Add one or more conditions to control when the customization is displayed during checkout.

4
Configure note settings
Customize the Link Title, Notes Title, and Notes Key for each cart item.

5
Add Display Settings
Add Character Counts from Display Settings 

6
Set the priority
Configure the Priority (0–100) to determine the execution order when multiple customizations are eligible.

7
Copy the Placement ID
Copy the generated Placement ID from clipboard icon. You’ll use this in the Shopify Checkout Editor.

8
Preview
Preview shows , How this block looks like at CheckOut.

9
Save the customization
Click Save to keep your configuration.

10
Activate the customization
Change the Status to Active using toggle button to enable the customization.

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

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 – Edit cart items app block, and paste the copied Placement ID.

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

Why does it matter?Cart Item Details -> Add Notes customization for adding custom notes can improve AOV by 10%.
