Import of model form HFSS to CST and Boundary conditions

Hi
I am working on wakefield analysis in a Multi-Bunch Normal conducting FEL Structures.
For this I used HFSS for modeling as I wanted to plot Dispersion Curves for all cells so I used master slave boundary condition.
Since there is no specific tool in HFSS for wakefiled analysis so I imported the model in CST Wakefield solver.
I have following questions

1.Why my model is not Editable when it was imported from HFSS to CST? Is there any solution?
2.What is the equivalent of Master-Slave Boundary conditions of HFSS in CST?
3.What will be affect on materiel assignment?

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