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From the TT help section:
"Line 7a. Cost or Other Basis (1e)
If "Yes" is marked on line 3, the amount should be that in Box 1e of Form 1099-B or the equivalent statement, if present; usually this is the purchase price plus any purchase expenses plus any selling expenses not included in Form 1099-B, Box 1d.

For sales with "No" marked on line 3, you may use the amount from Box 1e of Form 1099-B, if present, or you may enter a different value for the cost basis if you believe the cost basis provided to you is incorrect.

IRS Publication 550 or Publication 551 may help you determine the proper cost or other basis amount, if necessary.


Line 7b. Corrected Basis (if applicable)

If "Yes" is marked on line 3, but Form 1099-B or the equivalent statement reports an incorrect basis amount in Box 1e, enter the correct basis amount here. (The incorrect amount should appear as the Cost or Other Basis on line 7a.) The program will report this transaction on Form 8949 with adjustment Code B, and include an adjustment equal to the amount on line 7a less the amount on this line."

Not sure about 8949, since everything there would require and override, and I don't trust TT with overrides.