hi HEE
what is " lange circuit " you mean?
I think you should choose one mode, it is enought for the simulation, if you want to choose two, Hfss will understand that you will have two times of simulation, that mean two set-up, And with the newline, for a normale simulation, keep the defaut without choosing the line of the waveport (use in the case of master and slave port), could you paste the graphic here so we can see more clearly?