Hello Claudia,
1) It can be done manually. I don't know if it is possible to do it automatically. I will discuss this with our Clarizen Go Team and get back to you on this.
2) Are you talking about the OOTB sync from Clarizen Go to Clarizen One? If so, you can find the Clarizen Go task ID in the Link to Clarizen Go field.
Thank you,
Roland