Very interested in this feature too! Otherwise, the CVS Importer is useless for my team.
There needs to be a Section ID and a Task ID, and frankly a subtask ID that are all exportable. And then any NEW item you upload without an existing ID would generate a new section, or task, or subtask. Any EXISTING item you upload with an existing ID would update existing sections, tasks or subtasks.
This is pretty basic stuff Asana.
Upvoting because, well, it’s stupid that you can’t do this.
any update on this ?