Can't delete volume C

Problem resolved. One cannot select the option to prevent the initial dialog warning (the one posted, above) from creating additional dialogs. Following that rule, despite the warning message, which seems to not apply to my setup, I get the dialog requesting for the inpute Delete Volume as text. All proceeds as expected. I get a dialog saying the volume is deleted, then immediately requesting to create a new. I get the opportunity to reduce the amount of space consumed by the C volume. Unfortunately, the software doesn't give the opportunity to create multiple volumes at once, then suffer only one reboot/resync.