Get your taxes done using TurboTax

@Polkadot1   " I can only do the second taxpayers' import if I accept the prompt to "Delete Old Data" wherein it erases Taxpayer 1's Consolidated 1099s."

 

I didn't include that part of this issue in my post since it was in your OP, but I have that issue as well and it is a BIG one.  It is unbelievable that this made it into a public release without anyone testing these scenarios beforehand.  That is just basic IT Quality Assurance and Change Management stuff.