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krishna guptakrishna gupta 

How to achieve the merge field functionality in visualforce page?

sfdcMonkey.comsfdcMonkey.com
hi Krishna gupta
go to below link for your solution
https://help.salesforce.com/articleView?id=pages_merge_fields.htm&language=en_US&type=0
let me inform if it helps you
thanks
krishna guptakrishna gupta
Piyush,

The URL which you provided only showed how to use the merge field expression.
I want to create a merge field functionality
Below are step by step image.

Step1:
----------
I want to create a button.
User-added image

Step2:
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Once i will click on button, i want the below functionality.
User-added image
User-added image