Question on making the partitions

[Avrahami David]

Title: Question on making the partitions

Hi,

I'm installing a customized RH linux with kickstart.
I would like the default partitions to be defined as follows:
/               - 2GB
/usr    - 4GB
/opt    - 2GB

The remaining FSs should be a percent of the remaining free space (after allocating the above):
/home   - 50%
/var    - 30%
/tmp    - 20%

Any clue how should be my ks.cfg?

Thanks,
David