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Custom Portlet showing results in Hierarchy

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Raj Ghimire
Outstanding Contributor.

Custom Portlet showing results in Hierarchy

We are exploring options to creating a custom Portlet something like OOB portlet "Request References" where I can show results in hierarchy level.
I have no problem getting the query for the Portlet but I am just not sure how I can display it like it displays in this oob Java Portlet where it separates and groups Parent and its References.

Can anyone suggest me any ways we can achieve "something similar" without haivng to create a Java Portlet ?

Thanks in advance.
-Raj