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RJ12RJ12 

How to map fields to contact object upon Lead Conversion?

I have 2 child objects related to Lead and I have another 2 child objects with same fields(Same Label, API names) related to contact object. 

How to map/copy fields of 2 child objects related to the Lead object to 2 child objects related to Contact object upon lead conversion?

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Raj VakatiRaj Vakati
You need to use the apex trigger on lead conversion or you can do it with Process Builder as well. 

http://blog.deadlypenguin.com/blog/2014/07/23/intro-to-apex-auto-converting-leads-in-a-trigger/