Need to have a unique identifier to update the main mass additions spreadsheet

Summary:

Business Justification:

Need to have a unique identifier to update the main mass additions spreadsheet from various spreadsheets sent by other business users

Business Requirement:

Need to use the unique identifier (preferably the addition identifier) that will be used in a vlookup formula so that business who needs to upload the mass additions template for posting will not have to update manually the required information.