When you need to rotate an object this is the tool to use. Rotate tool…
Vectorworks Tip #072 – Basic Tools – Mirror Tool
Use this tool to mirror an existing object or objects. This tool works in both 2D and 3D and it can be used to mirror the original object, or it can be used to mirror a copy of the original. In Vectorworks 2014 you will now see a preview of the mirrored object so you can see if it is going to be placed correctly.