Mirror functions as applied to AFX beams.
I'm probably just missing some detail, but I'm wondering about mirror functions for AFX beams. Can't seem to find a way to mirror things without doubling or duplicating parts.
Almost every demo I've seen on AFX has symmetric aspects, so I can't figure out why they would create them redundantly. Sure, reusing beams is great, but why not build one side and mirror it?

A simple example is shown in this image. I have the first portion, but can't figure out how to get to the second without a higher level assembly -- but either way, it's wrong because you'd never build it with so many "half" parts.
That's a simple example, but I need it for much more complex work. The effort to do the same thing (almost) 4 times is driving me nuts. Please let me know what I'm missing. I'm probably just a dough head, but I can't find anything in a Google search or in PTC's help. Maybe I'm using the wrong search words?

