If you created the promotions with the old Promo Template, please fill it up again by copying and pasting the same details for the promotion that you want to extend and just change the start and end date of the promotional period. After completing it, email it to sellersupport@redmart.com, considering the 10 working days notice we need.

If you created the promotions through Partner Portal, you should simply create a new one and set up the new desired start and end dates.