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How do I send data between tables without overwriting existing data?

April 2026

Quick Answer

# Sending Data Between Tables Without Overwriting To append data to a destination table while preserving existing data: 1. Use the **Send table data** action to transfer data from your source table to the destination table 2. In the mapping step, double-click each field to map it to existing columns in the destination table 3. Configure the advanced settings: - Enable **"Map to existing columns"** - Disable **"Auto-extract new columns"** ## Important Notes - This approach appends new rows without modifying existing ones - **Clay automatically protects manually entered data** in exist

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1 Answer

Sending Data Between Tables Without Overwriting

To append data to a destination table while preserving existing data:

  1. Use the Send table data action to transfer data from your source table to the destination table
  2. In the mapping step, double-click each field to map it to existing columns in the destination table
  3. Configure the advanced settings:
    • Enable "Map to existing columns"
    • Disable "Auto-extract new columns"

Important Notes

  • This approach appends new rows without modifying existing ones
  • Clay automatically protects manually entered data in existing columns from being overwritten
  • Clay will only auto-map to columns that contain formulas
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