@Ismaerienne I was just at Fordham yesterday and went to the presentation regarding study abroad and asked this question specifically. What I was told by the head of the study abroad office is that the National Merit Scholarship (and any other fordham scholarships as well) transfer over in full for the three Fordham Admistered Study Abroad Programs (in London, Granada and Pretoria). The scholarships also transfer over in full for study with the roughly 20 programs that are Fordham Exchange program partners. The other programs during the school year are subject to some sort of mathematical calculation to determine how much of the scholarship can be used. Study abroad outside of the school year is available, but not covered by the scholarship (but neither are summer courses at Fordham). Here is a link to the page on the website that describes the programs available (each heading is an active link): https://www.fordham.edu/info/20919/programs
We were impressed and my son plans to commit to Fordham this week. Good luck to you! 