Cascading Drop Downs

Hi,

Is it possible to have one header expand to reveal another set of header which can be expanded independently in a cascade?

Like this:

+Heading 1 Here (collapsible)
+Sub Heading 1 Here (collapsible)
Content below sub heading 2
+Sub Heading 2 Here (collapsible)
Content below sub heading 2

+Heading 2 Here

and so on?
Thanks
Andy

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