In Product overview > Click Countdown Time
From your Shopify admin, go to Settings -> Custom data
Click Products → Add Definition.
Please enter correct Namespace and Key as we noted below.
From your Shopify admin, go to Products -> All products.
Find and choose the product that you want to edit.
In the Metafields, please insert content for "Count Down" field.
Or you can access link ' Enter the end times here.' => You can enter Count Down for each product