See this FAQ on switching to the CD/download version of TurboTax:
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https://ttlc.intuit.com/questions/1901476-how-do-i-switch-from-turbotax-online-to-the-turbotax-softw...>
Given that the feature you need is not supported by the online version of TurboTax, you might be able to get a discount on the CD/download version of TurboTax by calling customer support.
