Change Prices on Multiple Products

1.Product Price Bulk Editing (WordPress Dashboard)

1. Go to the “Products” admin page.
2. Tick all the products you want to edit the sale price for.
3. Click on Bulk Actions > Edit.
4. Select Sale > “Change to:”
5. Choose “Set to regular price decreased by fixed amount or %”
6. Enter e.g. 30%
7. Update.