Opening up a task or event in edit mode at the end of the screen there is a field for entering the text of a subtask / shopping item. Simply, type in the text and click on “create subtask”.

For instance, we have a Jazz session in the garage, and for this we need Beer, Flute and a Hammond Organ.

By clicking “Edit” on the task, it makes it possible to add different subtasks by enter the item and click “Add item”