Treeview format for a report

[Lisa M. Fida]

I want to create a multi-tiered report that's formatted like a treeview. I
have items that belong to classes, and the classes can belong to other
classes. I need the report to list the class and any subclasses and items
that are a part of that class, i.e.:

Class 1
Items...
SubClass1.1
Items...
SubClass1.2
Items...
SubClass1.2.1
Items...
Class 2
Items...
SubClass21
Items...
SubClass2.2
Items...
SubClass2.2.1
Items...
etc.

The number of parent and/or child nodes can vary. There's no way to know
how many layers are needed until the report is run.

I'm not sure how to go about this. I use a recursive procedure to fill a
treeview in the same format as above. I just don't know how to do this in a
report.

Thanks for any assistance in advance.