[CST] How to simulate Radiated Spurious Emissions (RSE)

i know there is a way to simulate radiated spurious emissions using CST. can anyone have methodology documents or know how to do it step by step?

EM simulation can be involved in different ways, e.g. determining the antenna transmission characteristic for off-band frequencies, a relative straightforward task. Or almost boundless, analysing the PCB or instrument enclosure capability of emitting chassis radiation.
What's your topic?

i would like to predict radiated spurious emission test failure via EMC/EMI simulation.