Forms mode is available; however, for individual customers, it is not recommended because it can cancel the TurboTax 100% accuracy guarantee.
Here is information about Forms mode.
Regarding the instructions to combine forms, it will not change the bottom line and will not cause a discrepancy in tax owed. Since you use the original lender as the name in the 1098, it carries the original amount of the loan. Since TurboTax customers are covered by the accuracy guarantee, any audit questions involving the combining of 1098 forms will not be a problem.
Interest from the original loan remains deductible so there won't be a carryover issue.
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