You are able to enter "various". Under the When did you receive this investment?, select the second option, Something other than a date.
Also, since the gain on that stock sale was included as income on your W-2, to avoid double taxation:
- You will need to change the stock basis on the date of the sale, to the price on the date of sale.
- The result is zero gain or a minor loss due to brokers commission/fees.
- The IRS will expect to see that information on your tax return.
To enter your 1099-B form, see Where do I enter a 1099-B?
For additional information, see the TurboTax article: Non-Qualified Stock Options.

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