@Marie, I have tried to get the dependacies to work but it only shows up as a column adn does not map teh dependent on, see screen shot .
HI @Dave_Main, could you please forward your CSV file + the URL of your project in Asana to our support team for them to investigate? Because we need access to your private data, these issues are better resolved offline with our support team 
You can reach out to them following these steps: https://forum.asana.com/t/how-do-i-contact-support/19057/7?u=marie. Thank you!