You can set the sale price, sale price start and end date for multiple items by exporting products, making changes in bulk and then uploading the file into SA.
Here are the steps to follow:
1- Select the required products then go to Export>Custom…
IMPORTANT NOTE: If you want to enter sale price on channel level, you need to go to “Export>Export Overrides>Custom Overrides” after selecting the product on the related channel.
2- Select the related fields from the Pricing tab.
3- Download the file from the Notifications center from the top right.
4- Specify the sale price, sale price start and end date. Save your changes.
IMPORTANT NOTE: After you set up the sale price, you must enter the start and end dates in “year-month-day” format e.g. “YYYY-MM-DD”.
IMPORTANT NOTE: If you want to disable the sale price, you must delete the data in the sale price column.
5- Upload the file back into the SA.