To change the transparency group properties

To change the properties of a transparency group

Open the Inspector dialog.
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.