This example shows you how to mirror curves using a user-defined mirror plane, using the Curve Editor tab. It uses the Keep Original 
option so that you can easily see the effect of the transformation.
- Select the curves you want to mirror (selected curves are yellow).
- Click Curve Editor tab > Edit panel > Transformations > Mirror to display the Mirror toolbar.
- Click
, the cursor changes to 
. - Press the mouse button to show the start of the mirror line and drag it to the end point of the mirror line.
- Release the mouse button to define the mirror plane and mirrors the selected curves.
Note: You can also mirror selected items by clicking on a single straight line. You do not have to click first.
first.