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Andy KirbyAndy Kirby 

add a duplicate button to check for duplicate customer when filling out lead page before saving

*Newbie alert*
Hi, i am new to this. I am trying to find out how i can add a check for 'duplicate customer' button next to the customer name when filling out the NEW lead page.
I need to be able to check for duplicate customer before the information is saved as my call staff need to know before they call as they are still filling out the information when cold calling.
If the button could check for company name, customer email and customer tel, for duplicate it would help so much.
Could someone be so kind as to help me with a step by step on how to do it please.
Many thanks.
  
Rahul KumarRahul Kumar (Salesforce Developers) 
Hi Andy,
  • Maintaining clean and accurate data is one of the most important things you can do to get the most out of Salesforce. Use Data.com duplicate management to control whether and when users can create duplicate records in Salesforce; customize the logic that’s used to identify duplicates; and create reports on duplicates that users save.
Please refer the below links for further reference. I hope it will be helpful.

BestRegards
RahulKumar