Link subtasks to a task
There are subtasks which requires it's own list, reminders & notes.
For example, Let us suppose that there is a task 'Go to the Market' with the following subtasks :
& few others
And few of these sub-tasks require their own task like 'buy grocery' & 'buy stationary' requires a list with it's own reminders & notes.
In that case, one can create a task of 'Buy Grocery' but it's not linked with the 'Buy Grocery' subtask.
So, it must be possible to link the subtask 'Buy Grocery' with the task 'Buy Grocery' and click / touching on 'Buy Grocery' can take you to the task 'Buy Grocery' which must work seamlessly in web, mobile apps etc.
Ron G commented
This is a great idea, I also added a similar enhancement request titled
"Allow Tasks to be "REFERENCED" as subtasks for other Tasks (across different Lists)."