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Chetna AgrawalChetna Agrawal 

Field update on lookup object

I have formula(text) field in Contact which return text, i want its value in Email field on Opportunity object.
I have tried by workflow rule and field update, but it is not working.
You can do that using Process builder. Please not that if its email field then the text should be in the email formate else it won't allow you to save the record.

Check this link to know more about process builder -
Ashish Dev 3Ashish Dev 3
you need to write trigger for updating related cross object fields.
Becka DBecka D
Chetna - How is this contact related to the opportunity? It is using contact roles, or is it just pulling directly from the account related list? I believe that Karanraj is right in that you can use process builder to achieve this, but to give you additional help, we would need more details.