Symmetry
This command makes a mirror image of the selected objects. With this command you can do a:
Central symmetry
Axial symmetry
Planar symmetry
Requirements
Select the object(s) to be mirrored and launch the command.
Choose the symmetry type. The corresponding buttons are automatically displayed.
Define the position of a point for all 3 symmetries.
Define the axis direction for the axis and planar symmetries.
Select whether Create copy is needed or not.
Optionally, you can Preview to see if the result is correct.
Validate the command with OK, or, close the dialog box with Cancel.