ZRECALL

This command will clear out all of the rooms in the given range and 'reset' them to the contents of what is specified in the zone table.

The complement to this command is zcommit.

If you wanted to change the weapon that your Orc Guard carried when it reset, a plausible sequence of commands would be:

zload 11000 11099      Load up your current set of zone commands.
zrecall 11003 11003    Assume the Orc Guard in question is in room 11003.
force guard rem sword  Change the Orc's weapon.
force guard junk sword
oi dagger
give dagger guard
force guard wield dagger
zcommit 11003 11003    Commit the 'new' guards configuration.
zsave 11000 11099      Save the zone commands back out to disk.