Append new fields based on drop down list

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tryvltkcb
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Joined: 10/25/2018 - 02:49
Append new fields based on drop down list

Hi all,
I'm writing a script appending new Standardize fields in all projects. Is there any way to let users choose the fields manually from a dropdown list to make the formula for these Standardize fields? 
 
E.g: In the picture attached, users need to choose the correct fields manually (Users or Users_2) to append createdBy field which is a standardize field. The name of standardize fields remain unchanged among projects.
 

Images: