title: Iterate over bus signals in Simulink / Reuse subsystems without copying
body: <p>In Simulink, I need to perform the same (non-trivial) operation on multiple buses.
  I thought about implementing that operation as a subsystem and reuse it, but that didn't work out well.</p>
  
  <p>I wonder now if it is possible to iterate the signals/buses within a bus to apply the same operation multiple times and then bundle the results together again. How would I do that?</p>