Get a copy of EMS Quickdesk, IB Expert or IB Workbench.
all of these tools have the ability to create autoinc fields for you.
IB expert even has personal edition you can use for free.

--- In ib-support@y..., "Yong Khun, Loh" <ykloh@l...> wrote:
> hi there,
>
> how to set an integer field to be auto-incremented when every
new record is
> inserted? thanks in advance.
>
> YK (Yong Khun, Loh)
> <ykloh@l...>