To separately report more than one foreign country for Schedule K-1 (Box 16A for 1065 or Box 14A for 1120S), you would need to create a separate Schedule K-1 and only complete Box 16 or 14, respectively.
You only need to fill in the partnership's name and EIN, and the Box 16 or 14 country name.
Alternatively, you can select "Various" in the country name drop-down list.