Step 1: Add sub-tasks using checkboxes in the long text field type.
Step 2: Group by task name.
And voila, you’re done! 
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This is a silly question but how do i get the checkbox appear in the Long text field type? It only lets me add description…
Only issue with this is that you need to double click the long text field first and then click again on the checkbox. But still nice.
Here you are: Long text field.
Each checkbox is represented by
- [ ]for unchecked and- [x]for checked.
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thank you Olga, i now understand 
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