Barath,
SLD is where all your products, Software components, technical systems and business sytems for dev, qa and prod are created. First you have to create product attach it to software component and assign technical system to the SWC and business system to this technical system. Then import this SWC into IR. Check this weblog and docuemnt on this:
https://www.sdn.sap.com/irj/sdn/go/portal/prtroot/docs/library/uuid/9e76e511-0d01-0010-5c9d-9f768d64...
/people/naveen.kumarh/blog/2007/02/28/discovering-sld-part-1
/people/sandro.garofano2/blog/2006/12/08/sld-transport-target-creator
/people/srinivas.vanamala2/blog/2007/02/05/step-by-step-guide-xml-file-2-xml-file-scenario-part-i
This all depends upon your clients requirements. To have multiple SLDs is not recommended because to maintain them will become hard. So in general you will one SLD for both DEV and QA and one SLD for PROD.
---Satish
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