Dear Dave,
Thank you once again for quick reply.
I will proceed with you suggesting, but at what level or I would say what will be the triggering point of transfer the cost estimate to COPA? As I think we are talking about the Record Type " F " would it be a billing or PGI ? I mean after which transaction posting I can see Standard Cost Estimate is transferred to COPA ? ( Sorry being pedantic ! 
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Thanks again for such concrete clue, life savior ! 
Regards,
Sharvari Joshi.