Hi Naveen,
First load data from ECC to BW and then Data is loaded from BW to BPC. Other way round is to Export data into flat file from ECC and then Import the same flat file to BPC.
Also common Tables in ECC which are used to load data in BW is FAGLFLEXA, BSEG. Further Standard Info Cube from which data is loaded from BW to BPC for financial purpose is 0FIGL_C10.
Regards
Bhagyesh Ravange