This is an incredibly important feature request. Given that Whiteboards are mindmaps on steroids (which is proven as seeing mindmaps are a feature of whiteboards too) you should be able to map the entire project inside a whiteboard, organize it as a project manager and complement it.

Currently adding a task card just adds the parent and you would have to add the children manually one by one, for N levels, which is wholly unrealistic.

Subtasks should automatically (even if as an option) be added to imported asks WITH an auto-refresh for when new sub tasks are added.

The brilliance of whiteboards would be to create one immediately after making a list, mapping the entire project there by creating cards which means at the same time the relevant data is also added for the team to actually work on it. Makes it a powerful creative tool for project managers and saves time from double data entry.