How to select records in batch?

Hi Friends.

I want to select 10 lacs records. But if i used for all entries also it is giving error of time out. now i want to select records ina batch og 100000. Means forst it will select 100000 records and move in a internal table ..after that it will again fetch next 100000 records and append in that internal table like that..Is it possible..how to do this? i am selecting BELNR from BKPF and using FOR ALL ENTRIES fetching records from BSEG. requirement is such as i have to fetch records from BSEG only and not from BSID,BSIK... like tables..

Please help me...its urgent friends....