Well in that case you could always fiddle this one on the command line in CcpNmr Analysis, @JCASSAR.
Open the Python Console with Space,Space and then copy in the following code (obviously replacing the correct PeakList name/PID at the top):
pl = get('PL:noesy.1')
for pk in pl.peaks:
pk.volume = pk.height
That will simply set your volumes to be the same as your heights and you can go from there.
Copy the PeakList into a new one first if you want to keep this separate from a PeakList with actual volumes.
Vicky