Editing the Block diagram of a schematic

Hello, I experience the same problem and I don't think there is a solution. I believe that not many people use .bdf files. I've posted questions regarding .bdf files and symbols and not many people respond. I can see that within a year or so I'll not be using .bdf in my designs because the Quartus simulator will no longer be available and you will need to use a third party simulator such as ModelSim which doesn't support .bdf files.