Hi

From the 4500 configuration guide

"Copying Files to the Standby Supervisor Engine

If you want to manually copy a file from the active supervisor engine to the slot0: device on the standby supervisor engine, use this command:

Switch# copy source_device:source_filename slaveslot0:target_filename

To copy a file to the bootflash: device on a standby supervisor engine, use this command:

Switch# copy source_device:source_filename slavebootflash:target_filename"

Attached is the full link to the 4500 redundancy documentation

http://www.cisco.com/en/US/products/hw/switches/ps4324/products_configuration_guide_chapter09186a0080233f9e.html

HTH

Jon