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Ajay.DixitAjay.Dixit 

prepopulate Lookup Value

I know when we create  Detail Object from Master Related List through Standard "NEW" button Lookup to master gets prepopulated. if I want to acheive same through "NEW" button which come after click of child object tab i.e. prepopulate with Lookup value is it possible. For information that master object unique for User Logged in.

NikuNiku

Then you need to overide the new button. there will be some controller/Extenstion who will find the value for the lookup that will be your business logic.