Confused over linking between asset folders

First, really enjoying Forge so far, it seems to be a very powerful tool.
My issue is that I can’t figure out how to link assets between different asset folders in the Asset Library. Example, I have a folder entitled NPC’s and inside that folder I have a NPC icon that I want to either link or copy (whichever is easier) to the the NPC’s folder found inside the World folder (it’s World folder > Specific world folder > NPC’s folder).

Thank you for your attention to this matter.