You can shift the hue of the area defined by a secondary using the Hue Rotator.

To shift the hue:

1. In the Secondaries menu, right-click a secondary layer to activate it.

   
   

2. Define the area to be selectively colour graded by creating a key, adding one or more geometries, or combining a key with one or more geometries.
3. If you are colour grading geometries, enable Geom. This ensures that the colour correction will be applied selectively, rather than to the whole image.

   
   

4. Click Grading to display the Grading menu.
5. Click Hue and then drag the Hue Rotator to shift the hue. To shift the hue clockwise through the hue spectrum, drag right. To shift the hue counter-clockwise, drag left.