@arizmenda I don’t think Obsidian plays well with file symlinks, but I could be wrong. Test this first before going haywire with it!
@arizmenda To be clear, are you talking about keeping the same note in different vaults?
If you are talking about referencing the same note in the same vault in multiple places, I think you’re missing the fundamental affordance of linking in the context of folders. The embedding solution suggested by @minhthanh3145 belies a deeper solution, in the form of a question: why do you need to re-represent the note in multiple places in the folder structure to begin with? You can reference or embed a note from anywhere in an Obsidian vault—the location of it doesn’t matter.
It may help come up with suggestions (or clear #feature-requests) if you can explain a bit more about why replicated notes in the File Explorer would be useful to you!