Thanks nexchap but your methods needs a slight adjustment when the MLP (PTP) has been held long enough for the Adjusted basis becomes negative. TurboTax wont allow a negative value for line 7a "Cost or other basis".
Enter the actual sales data into the 1099-B Wks and then from the received K-1 from the MLP enter the Column 5 "Cumulative Adjustment to Basis" into line 7 of the K1P Addl Info. I added Supporting Details for the line to explain what I did. You can enter it into the Interview but you will still need to go the the form to add the Supporting Info.
