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That won't actually change the pin names though. This is one of the problem with schematics, as a lot of the cutting and pasting things just don't work. You will have to hand-enter them. You could also try VHDL/Verilog. Take your .bdf and go to File -> Create HDL File for Current File. Then you can edit the HDL. (It's still going to take some manipulation, but text manipulation is generally much easier.) Note that you won't be able to convert it back though, i.e. you're committing to learning HDL, which isn't a bad thing.
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I like the top level to be schematic--it helps show the flow better. I use Verilog for everything underneath the top level. Yes, I could use Verilog as the top level but I thought there might be a way to copy names in from Excel like you can do for pin numbering.
Thank you!