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Krish NKrish N 

How to populate fields on a record based on it's related list values?

I've a juntion object "Affected product" which relates to "Case" and "Installed product" objects. Whenever a service case is created, the product information must be entered. I've the Affected product related list on case layout, clicking on new affected product will let me enter the product number, which looks up to the installed product object and fills the details in the related list. I want few fields on my case record to be populated based on the information present in the related list. How do I do that? From the below screenshot, I want the Installed product ID, Model Number, Product Name fields to be populated on the case record.

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Krish NKrish N
Any help guys?