Not too long ago, I wrote a blog about creating new, secondary lists in Google Tasks. That is a great organizational tool, but you have to switch over to those lists to see them. More importantly, you need to remember to switch over. As my colleague Kathleen Giannandrea says, "Out of sight, out of mind". If you fall into that category, the subtasks function in Google Tasks will be helpful.
For example, if you have a separate list in Google Tasks to remind you to make or check on IEP accommodations, you could, instead, create a Task just for IEP Accommodations with accompanying subtasks. This will keep these tasks at a glance in your primary list without having to switch lists to view. One downfall to adding subtasks to a task is the inability to set it to repeat. You can set a one time reminder for the "parent" task.
Get started by creating a new task in Google Tasks found in the right side panel in Gmail, Google Calendar, Google Docs, Google Slides, Google Chat, Google Drive or Google Sheets.