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VSK98VSK98 

Update a contact field when user selected the existing contact during lead conversion

Hello All,

I would like to update the field in contact when the user selected the existing contact during lead conversion using out of box ....

Adv thanks.

Regards,
VSK98
AnudeepAnudeep (Salesforce Developers) 
You can use a process builder to update your contact field. The criteria to identify the lead conversion event is when the IsConverted field changes from false to true 

See this Example

Please mark this answer as Best if you find this information helpful. It may help others in the community. Thank You!

Anudeep