Select the entities to mirror and then select the line of symmetry.
 

Optional Inputs

 

• Keep Original - Check this box to copy the entities leaving the originals in place.

 

 

 

First select the entities to mirror. Then select the two points of the mirror axis. This is the default method of defining the mirror axis. See Mirror axis below for optional methods.

 

Optional Inputs

 

• Do you want to copy - Check this box to copy the entities leaving the originals in place.

• Mirror axis - Use this option to set the method used for determining the direction of the mirror axis.
  
  Two Points - The mirror axis direction is determined by two points. The second point's relation to the first point defines the direction.  
  Horizontal - The mirror axis direction will be horizontal.
  Vertical - The mirror axis direction will be vertical.

 

 

 

• Assigning Names to Features (see CAD Tips & Techniques).