In order to be filed electronically using TurboTax Business, the information for the entire business return, including all Schedules K-1, must be entered using the interview and calculated by the TurboTax program. Circumventing the program calculations invalidates the TurboTax license with the IRS and would require you to file a paper business return (not recommended).
When there is a change in LLC ownership, it can be challenging to arrive at the desired result for income/expense allocations on Sch K-1. You may find it useful to access the underlying schedules using Forms Mode. The related forms are "Sch K-1 Wks" and "Schedule K-1" for each shareholder. To see the source of a number on a form, right-click the number and choose "Data Source" or the "About" link.