I work with SolidWorks 2016. I made an assembly of several parts constrained together by an assembly sketch, called "building opening". It is a door and its jamb.
How can a complete symmetry of this assembly be achieved? That everything is symmetrical (parts, sub-assemblies, sketches, constraints, etc.)
to achieve this symmety, you will need to put your assembly in a new assembly and create a plan or take a face of your ASM to make it, you will also need to create a congiguration of your assembly. Look at my tutorial and use it. It was made for one room but the principle remains the same.