I believe LinaJ2020's solution will work with some clarifications. When she mentions to combine all the 1098 forms I would just combine ONLY the interest paid. You can probably just ignore the rest and enter nothing for all the other fields.
The only issue would be if the paid mortgage(s) had points, then you may need to enter a 1098 for each of them to get the deduction for points. Then you could probably get away with my ghetto solution I had proposed before -- just enter zeroes for balances.
