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I'm not sure I understand what's your actual problem.

In IDF: SET Param = %param%

Then you add it as a GenOpt param in command.txt

Vary {
 Parameter{    // my EMS Global Param
    Name    = param;
    Min     = 0.1;
    Ini     = 3;
    Max     = 5.9;
    Step    = 0.2;
  }
}

Similar to the example files that GenOpt ships with, no? eg: https://github.com/lbl-srg/GenOpt/blob/master/example/energyplus/8_5_0/GPSHookeJeeves/command.txt