If you told the program that you rent out 25% of your house, and that it was rented for 10 months, the program (not you) will do the math *for you*. So you enter the total of what you paid for the house, and the total of the property taxes you paid. Take note that these are the only two things the program will prorate for you. Everything else (including insurance cost) has to be manually prorated by you.
Also, be aware this as been highly problematic for several years now, for those renting a part of their primary residence. So *check* *the* *numbers* when you're done. See IRS Publication 946 at https://www.irs.gov/pub/irs-pdf/p946.pdf and use the MACRS worksheet on page 36 of that publication. For line 6 of the worksheet use table A-6 on page 71. I can't stress this enough *CHECK* *THE* *NUMBERS*!!!! I fully expect them to be wrong in the program, unless the programmers have actually fixed this issue - which I doubt.
