Keysight Technologies 3458A Guide D'utilisation page 115

Configuring for Measurements 3
Deleting subprograms
The DELSUB command deletes a particular subprogram. For example, to delete
the subprogram named DCCUR1 send:
OUTPUT 722; "DELSUB DCCUR1"
You can also delete all stored subprograms and all stored states using the
SCRATCH command.
Keysight 3458A User's Guide 115