Go to Offer Box, and click Create button on Specific Offer
Click Create button on Create Product Offer:
Add one, or more products as you want:
Select one or more countries as you want, then choose the Shipping fee, and min/max time, or Select Group Country button.
Please refer this article on how to apply a group of country in an offer.
Next compose the offer, and choose the Currency settings and Time settings you want
You can see a preview of your offer in the right
Enable Schedule to show the offer at a certain time.
Click on Create offer button, and you can choose to publish the offer or not
Then you can check how your offer box appears on store
If you need some more helps, please feel free to contact us via live chat or email us at email@example.com