Not only can Siri create reminders for you and automatically add them to your Reminders app, Siri can also obey the lists you have already set up. If you don't want a new reminder to go to your default list, all you have to do is tell Siri.
How to get Siri to add reminders to specific lists
- Press and hold the Home button on your iPhone or iPad to launch Siri.
- Say something like ""Add bread to my shopping list."
- Siri will show you a summary of the reminder and confirm the list it'll be added to. If something looks wrong, tap the text to edit it, or start over.
- Once everything looks right, tap Confirm and Siri will add the reminder to the list specified.
Remember too that if you have already created a reminder and confirmed it, just say "Move it to my shopping list." or something similar and Siri can then move a confirmed reminder you just created to another list.