How can I configure additional packages

Hi, all: I want to install the xntp via autoyast. And it should be configuriert in the file /etc/ntp.conf after the Installation.By the way the file /etc/cups/client.conf should also be configured. Could somebody help me ? Is it possible, that I set the /etc/ntp.conf and /etc/cups/client.conf via post-scripts ? Regrads Jibin