I've got an HD full of NetBSD partitions:

sd0a    /
sd0e    /usr
sd0f    /usr/local
sd0g    /var


The sd0f partition is too big for my needs, and becouse I need a partiton
where to play with quotas I need to divide this one in two partitions.

The sd0f partition is so mapped:

        SIZE    OFFSET
sd0f    1141884 921268

1 cyl. = 436 sect.

How can I proceed in this job?

Thank you in advance