you can create your own security bars for windows in softplan using solids like cubes, 3d polygons, cylinders, symbol shapes, etc
and use the symbol wizard (read up on it in softplan HELP) to add it to your "symbols"
or
try the 'archives' and look up "symbol wizard" (in the forum) not sure how that works.
or
you can go over to the 3d warehouse and do a search for "security bars" and export to softplan and
also use the symbol wizard to get it into softplan "symbols" as a 3d model with a link to a 2d symbol
that you put on your drawing like all the other symbols.