If you chose for the option to simulate the witcher 2 save you will be asked right after the prologue some questions by an NPC.
Care: The Witcher 3 - Wild Hunt spoilers ahead
This happens right after you killed the griffin and decide to go to Jennifer. You meet her, she takes you with her and you meet a king, then during a shaving scene you get asked some questions about the witcher 2 decisions.
Care: The Witcher 2 - Assassin of Kings Spoilers ahead
These questions are:
- Did you kill Aryan?
- Did you choose Yorveth or Roche?
- If you picked Yorveth you'll 2 choices: did you save Triss or break the curse of Saskia? If you picked Roche did you save Triss or help him save Anais?
- Did you help Sile in the Megascope or not?
- Did you let Letho go or not?
