I modified the title of the topic because nested means that there is a Trace Reference within a Trace Reference. Normally, this is what nested refers to, such as in case of Hotlinked Modules.
Can you provide some use cases so people can have a better understanding of why this would be good in the program?
By the way, there is already a not too old wish about this, you might want to vote on that one too:
http://archicad-talk.graphisoft.com/viewtopic.php?t=45582
Currently the workaround would be to place those Views you want to see on a single Layout and display the Layout in your Viewpoint as Trace Reference.
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