Ericsson CGSN statistics configuration

Hi,

Could anyone provide me a detailed procedure for statistics configuration into CGSN 3.0 (Ericsson GPRS Node) and the way to transfer the statistic files into OSS (or external servers).
I’ve have created a test job, but all the data are collected into a
single file. What I need is multiple files per job, where
each file corresponds to a certain period of time, for e.g.
a file contains the statistics for an interval of 2 hours.