In all hierarchies where I want is to appear, I would have to add a reference. For example I create the Linux.Service.firewall**d**.md and in Security.Network.Firewall.md I add ![[Linux.Service.firewalld.md]] . That would be as if I had Security.Network.Firewall.firewall**d**.md ?? I guess it is possible to use Tags too like #Security.Network.Firewall ? (Not the exactly the same but could work too?)