Is there a way to make a mirror of an assembly and save it as a separate file in SolidWorks?

I'm using SolidWorks 2019. I have an assembly of a piping system with clamps, fittings, and pipes like the picture. I want to make another assembly which should be the mirror of this assembly about the midplane. If I use "mirror components" command, it makes copy of selected components but the original ones are still there.
Right now I just made a copy from assembly and flip mates and do the piping from the beginning.
But is there a way to simply mirror the assembly and get rid of the original one? It should be!!