Thanks for the response.

I used file manager to format the card. I then used Acronis to put the 2gb ext2 partition on the card. This made the remaining 2gb "unallocated." When putting the card back into the NIT (booted to flash), gparted shows that the ext2 partition's default mountpoint is /media/mmc2. What I need to do, I think, is remove this default mount point, establish a fat32 partition with the 2gb unallocated space, and establish a default /media/mmc2 mountpoint on the fat32 (if that makes sense). At that point, I can hope that the fat32 partition will act as normal "Internal Memory." But I can't figure out how to get to that point.