Routine to delete part of a raw description

Hi all, am totally new to LISP, have only every created super basic ones myself so bear with me..

I am trying to get a routine that will remove all but the first three digits of my raw description.

For example, raw description "30322" would be changed to "303".

Can this be done, how difficult would it be? My descriptions wont always be 5 digits so I cant just delete the last three.

Any help will be much appreciated, cheers!

Please check the SUBSTR function.

(substr "30322" 1 3)
[i]Returns:[/i] "303"

Regards,

Mircea

Thanks, that should get me started, ill see what I can do