Changing source system for BW quality

Hi all ,

I have transported 10 datasources from system DEV-BW to system QUAL-BW.

Both DEV-BW and QUAL-BW are connected to QUAL ECC.

The source system for 10 datasources in QUAL BW is QUAL ECC.

We have added another source system (PRE-PROD ECC) for QUAL BW.

Its possible to change the source system to PRE- PROD ECC for10 datasources in QUAL BW?

how to ensure that the next time, the transport of datasources takes automatically the source system PRE PROD ECC) in QUAL BW?

Thank you