Click on Price from the app's menu
Step 1: Create a filter to select the products you want to edit. I strongly suggest that you click on Preview matched products to ensure that the correct products have been selected.
OPTIONAL STEP: SELECT WHAT VARIANTS TO EDIT
In this step you would input the name of the variant option value. In this example, the name is Silver.
Select option value --> contains --> Silver
In the next step, you will select how to adjust the price. If you'd like to decrease the price by 20% you would select the following options:
Step 3: adjust price by percentage (with option to adjust compare at price)
decrease by 20%
Click on Start Bulk Editing Now