Click the Transparency
> Parent Transparency Group category.
Use the PitStop Select
Objects tool to select an object that belongs to the
transparency group you want to change.
In the PitStop Inspector dialog, click the transparency group that you want to
change.
The selected group is highlighted.
Switch to the Transparency
> Transparency Group category.
Make the required changes.
For an overview of the options, refer to Transparency group properties.
If you changed the blending color space (e.g. from CMYK to calibrated
gray), you may see the change immediately in your document. If you switch back
to the Transparency
> Parent Transparency Group, you'll see that the properties of the selected transparency
group have changed accordingly.