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How to retrieve the query value and used in the another field.

Hi i am new to salesforce and i create the form with multiple form field.
For example add more customer. 
I have the form details like customer name in 1st row.
then drop down add more as drop down list and then (eg 2 means it shows two form field like 1st row).
i need to update the refer field with 1st row customer name and i need check the add more customer mobile no is already exist or not.