If you want to check the Sub Task then you have to use the command “/tasks”. After running the command you will see an option “Select a task to perform action”. Now, select that task for which you want to show it’s Sub Task.
Note: You can only see the Sub Task after selecting any task ID only if any Sub Task is created for that.
You can also see the Sub Task in TaskOnBot web panel. To view, the Sub Task go to the “My Task” section and click on the three dots present in the right-hand side of the task lists.