Add or create the region set for where your product is available
Create New +
Name the region set
Select the countries to include form the map the list or continents
Select a previously created region in the list
Click Save changes
Add the same region on multiple product pages at once
Products ↓
Region Sets
New Delivery Region Set +
Name the region set
Select the countries to include form the map the list or continents
Click Create
To add this set to multiple product pages go to
Products ↓
Overview
Select the product pages you want this region set on
Click Edit
Select Regions
Select the region set from the list
Click Save Changes