How do you remove unwanted geocache listings from the GPSMAP 66i?

 I am unclear what "live geocahe data" is, but following the instructions on the support page did not remove the geocaches from the device.  If I download 30 geocaches  for a specific area, and only find 10 while there, I want to clear the remaining listings from the device before loading geocaches for another area.  This is a very basic function that worked flawlessly on other Garmin units I've owned over the past 20 years, but I can't figure it out with this device.   - HELP!