What you need to do is leave the first mortgage information you enter as it is, then make an additonal mortgage interest entry for $4,000, or whatever amount represents the rest of the mortgage interest deduction. The full amount of that one will show on your schedule A and then the interest from the home office entry will be added to it. Just make sure the combined value of your mortgage balances does not exceed the $750,000 (if that applies to you) maximum amount allowed for one hundred percent of your mortgage interest to be deductible. Those numbers entered in TurboTax will not show on your tax return, so you can manipulate the mortgage balances you enter.
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