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K RoyK Roy 

Writing formula inside process builder!

Hello Team, 

I am facing an issue while writing the formula inside the process builder.
I have used a custom settings, where i have got 6 custom fields and all of which are text types.
Now, while defining the criteria in the process builder, i want to first check if the fields are blank or not and then proceed to the next step, i.e the action, where i need to concat only the available fields, based on the country code. for E.g, Account_Identifier_City__c contains GB;IT;FR; in this manner in the custom setting, and the country code mentioned there gets to see the city value, which i need to print in a single text field by concatenating.

For the first step, what i have done is:
ISBLANK($Setup.Account_Identifier_Value__c.Account_Identifier_Address_Line__c) || 
ISBLANK($Setup.Account_Identifier_Value__c.Account_Identifier_City__c) || ISBLANK($Setup.Account_Identifier_Value__c.Account_Identifier_Postal_Code__c) || 
ISBLANK($Setup.Account_Identifier_Value__c.Account_Identifier_ABC_ID__c) || 
ISBLANK($Setup.Account_Identifier_Value__c.Account_Identifier_SAP_ID__c) || 
ISBLANK($Setup.Account_Identifier_Value__c.Account_Identifier_Status__c )
for the immediate actions, i am unable to figure out how to proceed. 
Can anyone help me in both these steps?