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How to pre-populate fields when creating a new record?

I have a custom parent object A and a child object B.
When I create a new record from the child object B via the related list, only the parent lookup field is defaulted and filled in.
When I hit create new in the related list, I need to add more fields to be auto filled in.
Is there an appropriate solution to such issue?
Please advise.
NagendraNagendra (Salesforce Developers) 

In lightning: you can do that using Set Predefined Field Values for Quick Action Fields . Here you predefine values for the new record created in quick action attributes and thus they get prepopulated when you click the quick action button.

In Classic: In classic, you can use URL hacking: Here you pass the FieldID and its value in URL params and they get set in the corresponding fields accordingly.

Src :
Src :

Hope this helps.

Kindly mark this as solved if the reply was helpful.