FM for splitting the records and then processing

Hi all

i have this requirement that there are records to be picked in my background job and to be processed. now the background job has to pick number of records first and process them e.g it has to pick the first 5,000 records, process them and then pick the next 5,000 records and so-on. now this is called a functionality of threading i think... and i have heard that there ia a standard FM in SAP to do this. but i am not coming across it. can anybody help me in this.

please ask questions if doubt any.

helpful answers will be rewarded.

thanks

jai