Mirroring objects

Hi, does anyone found a way of mirroring objects?

As I've made a whole model, made calcualtions and only after that found that it's mirrored. It's mirrored because I imported geometry from Autocad and swaped axes from x to y. There is a problem with exporting geometry and there were made a lot of changes in Plaxis, so reimporting and remodeling will take more than a couple of days. 

If anyone found a way of doing it with in Plaxis either with standard funcionality or with Python for example - it would be great. (I need to swap x and y coordinates for every object, for lines, points, planes and soils it can be done manually, but will take long hours, but for volumes it's not that simple)

How the geometry is within Plaxis and how it should be in Autocad.

Thanks!