BVAR filteration

Hi All

Please i need help in BVAR estimation
BVAR “bvar-a-la-sims” in dynare documnetation to get filtered_vars,filter_step_ahead=[1:8]) for the bayesian var.

The first question How i get the filteration step ahead for BVAR?
The secon question how I can deal with structural breaks in BVAR???


Both things are not supported by Dynare.