From the eBay promotion page, you will select the "Add New Promotion" button at the top of the page.
You will need to fill out all required information for the eBay promotion (Sale Name, Sale Type, Discount Type, Discount Value, Start date and End Date and select "Add New Promotion" at the bottom of the page.
Once the promotion has been created you will then assign listings to the promotion via a dropdown on the edit listing page. (Select the gear/quantity from under the eBay column to access the edit listing page)
From here, on the left side of page, scroll down and you will see the "Promotional Sale" dropdown for you to apply the promotion to a SKU.
Select "save changes" when you are finished, this will trigger a sync from Listing Mirror to eBay. Once the pending sync completes, your new promotion will be applied to your selected eBay listings.
If you have any questions regarding eBay promotions, feel free to reach out to Listing Mirror Support.