I suggest that you describe what you want in a bit more detail.
Several generalized options come to mind:
Perhaps the Virtual List method could be adapted for this.
A summary report based on the lowest level set of comments could include linked higher level comments in sub summary parts. Simpler than some other approaches but limits the number of "levels" to your nesting to a fixed limit.
Posting the text to a web viewer using HTML or other tools to produce the indented lists and sub lists might work.