The second example but starting from 300:
For Jan:
08A300
08A301
08A302
etc, etc.
For Feb
08B300
08B301
08B302
etc, etc.
For Mar
08C300
08C301
08C302
etc, etc,
Then for next year start at:
For Jan 09
09A300
09A301
09A302
etc, etc.
Thanks in advance for your help.