When editing a schematic, you can use the GROUP tool to select one or more Parts, then move the Group to a different page of the schematic.
If you attempt to do this in EAGLE 8.0.1 on the Mac (Sierra 10.12.3) the application will crash.
Crashed Thread: 0 CrBrowserMain Dispatch queue: com.apple.main-thread
Exception Type: EXC_BAD_ACCESS (SIGSEGV)
Exception Codes: EXC_I386_GPFLT
Exception Note: EXC_CORPSE_NOTIFY
Termination Signal: Segmentation fault: 11
Termination Reason: Namespace SIGNAL, Code 0xb
Terminating Process: exc handler [0]