You can run a query to find which records have a specific source code (or subsource code). Here's how:
  1. Navigate to Data Management > select Query
  2. Click Create a New Query
  3. Give the query a name, description, and assign a security category
  4. Set the Field Type to Biographical Information and the Field to Origin Source Code (or Origin Subsource Code); click Add Field Clause
  5. Enter the source code into the Current Value field; click Save
  6. Click Run Query