Log back into TurboTax and follow the steps in this link to get back to your investment sales section of the program.
Select edit using the little pencil icon to the right of the applicable investment sale.

Scroll down on the screen until you reach the input for Box 1e. The second box below that will give you the option to indicate "I have other boxes on my 1099-B to enter." Check this box. The program will then display the remaining options so you can proceed to enter any missing amounts as applicable.

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