Upload a CSV using the column template. Matches existing businesses by Address (creates a new one if no match) — renaming a business in the sheet now updates it in place; blank cells leave existing data untouched. Use an "Additional Subcategories" column (comma-separated subcategory names) to also list a location under more than one contest. If a Category or Subcategory name doesn't exactly match one already in the system, you'll be asked to confirm creating it as new or mapping it to an existing one before anything is imported.