Objects creation and modification	Modifying existing objects
Mirroring objects
Overview     Operations     Commands

How to mirror objects

1. Click on the menu Modify Mirror.
2. Select the objects to be mirrored.
3. Specify the first point of the mirroring line.
4. Specify the second point.
5. Press Y to obtain a mirror-copy of the original objects or else enter  N just to flip the objects, without duplicating them.

 Modify toolbar 

 Command line: MIRROR