Differential line port connection in HFSS

Hi, All
I try to simulate part of PCB, differential transmition line. as shown in pic:

line is located between GND plane
How to connect the ports in HFSS, to get differential s-parameters and then simulate this differential line
in SPICE simulator ?

Hello Sav,
I am having a similar problem as the one you have posted. Can you please let me know your approach to solve this?
Thanks, Meenu