Stock Countdown

For products have no variations:

Step 1: From the admin dashboard, navigate to Products > All Products.

Step 2: Select the product you want to set the sale countdown timer for.

Step 3: At the Product data section, choose Product type as Simple product

Step 4: From the tab Inventory, enable "Manage stock", set Stock quantity and Intinial Number Instock. (Initial Number In Stock is used to calculate remaining product percentage so please set it to be equal to Stock quantity)

For products have variations:

At step 3: Select Product type as Variable product

Step 4: Select tab Variations, click on each variation to display the setting

Step 5: Here you can install Stock quantity, and other settings.

Step 6: In Inventory tab, please set Initial Number In Stock similar to step 4 of product no variations.

Step 7: Click Save changes after finished editing.