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Pankaj IRTPankaj IRT 

if i want to show sum of the child object record in parents object record when relationship is look up then how could i do this

Pankaj - Check this below link for the different approach to having roll up summary field in lookup relationship 

Using Visual flow - http://thewizardnews.com/2014/05/22/roll-up-summary-field-using-headless-flow/
Declarative Rollup Summary toll - https://developer.salesforce.com/page/Declarative_Rollup_Summary_Tool_for_Force.com_Lookup_Relationships
William TranWilliam Tran
You can use triggers to do this, probably 5 or 6 lines for code.