We are trying to create a view where it only show cases group by parent subject. This view will be used for the CRM dashboard, by default you can only show all the subject in chart but group by parent subject is not an option.

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For example (The typical view in CRM Cases)
CASE 1 - SUBJECT 1 - PARENT SUBJECT A
CASE 2 - SUBJECT 2 - PARENT SUBJECT A
CASE 3 - SUBJECT 3 - PARENT SUBJECT B
and so on.
What we are trying to achieve
PARENT SUBJECT A - 2 ACTIVE CASE
PARENT SUBJECT B - 1 ACTIVE CASE
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Maybe someone can help or explain on how to do it. Thank you!