mention package groups as a parameter along with ks file ?

["linux brainstack" <linux brainstack gmail com>]

Hello,
I have created a kickstart file which has @ Base under Software.
But i want a way to mention additional package groups at runtime when the kickstart is triggered.

Is there any way ?
Either %post asking for package group name 
OR
along with ks file path we add one more parameter packagegroup name ?

Any Thoughts / Ideas ?

Thanks.