I would think that provided you refi'd and did not cash out, you would only need to enter the box 2 amount from the 1098, for the original 1098 and just leave it blank for the 2nd 1098.
If the refi was with the same lender, then I would think you can just add together the box 1 amounts, and enter information for the other boxes, only from the first, original loan 1098. Now I haven't taken into account any points that may have been paid on the refi, with that comment.
