Dear Sai,
For QA and PRD SLD there is no need for any changes in your scenario, if the Business Systems are been linked to there respective landscape (either Dev, QA & PRD ) Integration (PI) Systems then transport happens perfectly, hence no manual changes are required.
as long as this is the transport targets:
BS_DEV1 --> BS_QA1
BS_DEV1 --> BS_PRD1
BS_DEV2 --> BS_QA2
BS_DEV2 --> BS_PRD2
and this is the way the Integration server is related to business systems
PIDEV
BS_DEV1
BS_DEV1
PIQA
BS_QA1
BS_QA2
PIPRD
BS_PRD1
BS_PRD2
Regards