Hi Dipak,
I don't think we have detailed a step by step configuration document for SAP EM to SAP BW here. You can check Kevin's wiki post where he nicely drafted lot of information for us.
SAP EM Integration with SAP NetWeaver BI - Supply Chain Management (SCM) - SCN Wiki
You can check these:
Basic Settings - SAP Library - Basic Settings for Event Management
SAP EM BW Initial Load - Initial Upload (SAP Library - Basic Settings for Event Management)
SAP EM BW Delta Load - SAP Library - Basic Settings for Event Management
Click refresh button on those links, it will show you dropdown and you can check BI Settings for each visibility processes.
Regards
GGOPII