"How can I associate the 2 sales to the same RSU distribution?"
If you're using the RSU step by step interview, which sounds to be the case, you can't. There's no way to, in effect, tell TurboTax "The two 100 share vestings I told you about are really the SAME vesting." You need to break that 100 shares into two parts - still totaling 100 shares of course - and use those two "mini-vestings" in your entries into the TurboTax interview.
Tom Young
