Smart lists cannot include other smart lists?

Hello and thanks for the reply. I kept searching and came across this thread Explanation of filter logic - and/or/order of operations which did provide some clues on how to use filters. The problem may lie behind my keyboard but I did find it hard to understand the example used.

However, after persisting with it I was able to achieve what I wanted with the filter system.

  • Undated
  • Scheduled (OR 4)
  • No Tags (AND 3)
  • Tag with 'morn' (OR 2)
  • Scheduled Today (AND 1)

This got me to have the list only show tasks that are tagged with #morn and are scheduled for today, tasks that have no tag and are scheduled today, and all other tasks without a due date.

The other thread seemed to imply that the order of filters matters. Is that correct? I think the explaination is saying that one filter would always flow into the filter right above it irrespective of order of operation? Please would the following give a completely different result? Could you please explain why?

  • Scheduled (OR 4)
  • No Tags (AND 3)
  • Undated
  • Tag with 'morn' (OR 2)
  • Scheduled Today (AND 1)