I'm not sure what you mean by "import that file into an instance" but HyperLynx and ICX will simulate with the 8-port s-parameter without any issue. Where are you trying to use this model (i.e. HyperLynx LineSim, BoardSim, ICX, etc)?
Thanks for replying. I got the answer from Mentor Graphics supportnet..they send me the symbol for the staff I am looking for.
Thanks and Regards
Sending you with the symbol? There is no special symbol needed, only S parameter file is needed.
In linesim, you can put a package/connetor symbol, the RMB, assigning the 8-port S parameter file.