Yes, adjusting the cost basis is probably the most efficient way to get the gain/loss numbers in TurboTax to match your 1099-B. Adjusting the holding period would move transactions from short-term to long-term and vice versa, but this method may not yield the result you are trying to achieve. The firm that issued the 1099-B is probably the only source that can explain why your gain/loss amounts are reflected in this way.
@andrewmagee
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