how to derive capacitance matrix

I have a four core cable and I want to get the capacitance matrix over frequency.

I set the common screen to be ground and set the four cores to be different terminal, list them 1 to 4. and set them to be voltage terminal type with voltage of 1V.

I want to use parameter sweep of PortName. However, I am confused about how to define PortName in global parameter definition. I can give a name of PortName, but then what is the expression? I now set it to be PortName again and I get yellow warning. Simulation seems to run but I get nothing in result.

Another question is how can I get the result in a frequency range?

Thanks