Step 1: Go to Catalog Templates
Navigate to the Catalog Template section from the left panel.
Click on it to open the templates page.
Step 2: Create a New Overlay
Click on Create New Overlay at the top-right corner of the screen.
Step 3: Basic Overlay Setup
Enter a Template Name.
Select the Catalog ID.
Choose the appropriate Feed Label.
Select where the overlay should be applied (placement).
Click Continue.
Step 4: Select Products
Apply filters to choose the products on which the overlay should be applied.
Once the product selection is finalized, click Continue.
Step 5: Design the Overlay
Choose from an existing overlay template, or
Create a new design from scratch using the Overlay Editor.
Step 6: Save the Overlay
Click Next.
Review and confirm the Template Name.
Click Save.
Finally, click Done at the top to complete and save the overlay.