Meanwhile, back on topic, I generally build multi-platform stations using individual parts. They include tracks that have attached platforms and unattached platforms pieces to fill in the gaps. By giving the platforms common names with a track number, it is easy to recognize them as all belonging to the same station when issuing driver commands. Other pieces like buildings, canopies, fences, ramps, etc are added to complete a station.
Having a single object for all of these pieces might make it easy to place but is very limiting in that all copies in a route would look exactly alike, plus since it is not possible to modify the exact configuration of the platforms, you would need many variations with a different number of tracks and configurations to cover many possibilities. May as well have a set of parts.