how do i simulate chock in hfss?

Which definition of "chock" are you using?

You have to divide the problem into two parts, since you cannot simulate the diodes in HFSS. HFSS is passive full-wave EM simulator.

Using HFSS:
Add ports at the locations where PIN diodes and RF choke have to be placed and extract the S-parameters

Using Circuit simulator such as ADS or Ansoft Circuit tool:
Import the S-parameters and then add the PIN diodes/RF choke in the circuit to get the overall results