In TurboTax you must split the Schedule K-1 and enter it as two Schedules K-1, reporting the box 1 amount on one and the box 2 amount on the other. The sum of all the amounts in each number box on these should total the amount in the corresponding box on the original. In the case where I had to do this, I duplicated all of the Part I and Part II information between the two, then reported the Part III box 1 amount on one Schedule K-1 and everything else from Part III on the other Schedule K-1.
