With respect to your first question, yes, if according to your attorney your share is 50%, then that is the amount you should enter.
With respect to the second issue, you should be advised that entering a figure from Line 11A of your K-1 (1041) into the program will not get that figure to the proper line on your return. Per the IRS instructions for Schedule K-1, the figure, in most instances, should be entered on Line 16 of Schedule A.
See https://www.irs.gov/instructions/i1041sk1#idm139897273370240
The only way to get that figure to Line 16 of Schedule A in TurboTax currently would be to use Forms Mode which is only available in the desktop versions of TurboTax. You would then likely have to print and mail your return.
