Moises,

See the INDEX command in help...

>I have a table called clients.dbf and that
>table has a file called clients.cdx which
>index by name,street, etc...
>
> I use clients.dbf into a dataenviroment of a form
> The software has already been sent for many clients
>
> No a client wants also to index by city
>
> How can I programaticly alter the my clients' CDX file in order
> to also indexing by city ?