Navigate to whatever sheet you're planning on adding a task to.
Double-click the cell you want to type your task in.
Type the name for your task.
Double-click the cell beneath the parent task.
Type in the name of the sub-task.
Exit out of text editing and select the intended sub-task cell.
Press [[ctrl]] + [[]]]
Next, this is how you add a new row for another task.
Click the three dots on the left side of the sheet.
10. Click "Insert Below" or "Insert Above".