Countdown #
Step 1 :
Go to Store Admin –> Settings –> Metafields and metaobjects –> Click Products -> Click on “Add definition”
Step 2: Add data as below
Name: Countdown
Namespace and Key: custom.countdown (Must use this key)
Select type: Date and Time( Select Date )

Step 3 : Now go to your products and Scroll down to “Metafields” and Select Date from Countdown field and click save.

Short Description #
Step 1 :
Go to Store Admin –> Settings –> Metafields and metaobjects –> Click Products -> Click on “Add definition”
Step 2: Add data as below
Name: Short Description
Namespace and Key: custom.short_des (Must use this key)
Select type:Multi-line text

Step 3 : Now go to your products and Scroll down to “Metafields”, add text to the short description and click save.
