Thanks for your reply Vadim,
Your input is correct but client want to see complete line items, I mean if the records pertaining to 10001 the report should show me all the lines in the report.
I am still investigate the same to get the end answer that it is possible to expand or it is provided by default by SAP BPC.
If you have any good source of links please share the same.
Regards,
Rajesh. K.