Hi,
The shown list of the processes is thru for the whole Audio event. So if you want to apply the process for another part of the Audio event, just click to Add Process. This new process is applied to the 2nd Range selection, and you can edit the settings. Thanks to this, you can later switch between the both processes and edit them.
Unfortunately the missing part is, that you have no visual feedback, which process is linked with witch Range selection.