1. Identify the Data: Determine which tables or data sets you need to transfer from SQL Server to Teradata.

2. Data Cleanup: Ensure that the data is clean, consistent, and conforms to the data types and constraints in Teradata.

3. Create Scripts: Write SQL scripts to select the data you want to export. It's important to consider the correct ordering of columns and data formatting.

1. Use BCP Utility: The Bulk Copy Program (BCP) is a command-line utility that ships with SQL Server. It can be used to export data efficiently.   

   Example command:

   ```shell

   bcp "SELECT * FROM YourDatabase.dbo.YourTable" queryout "C:\export\data.txt" -c -t"," -S YourServer -U YourUsername -P YourPassword

   ```

2. Choose the Right Data Format: Decide whether to export data in character format (-c) or native format (-n). Character format is generally more compatible.

3. Specify Column Delimiter: Use the `-t` option to specify a field terminator, such as a comma for CSV format.

4. Handle Special Characters: Ensure that any special characters or delimiters within the data are appropriately handled or escaped.

1. Create Tables: Define the schema in Teradata to match the data being imported. Make sure all tables and columns are correctly defined.

2. Set Permissions: Ensure that the user account you’ll be using has the necessary permissions to create tables and insert data.

1. Move the File: Transfer the exported flat file to a location accessible by the Teradata system.

2. Secure the Data: Ensure that the data transfer is secure, especially if it contains sensitive information.

1. Use Teradata Load Utilities: Teradata provides several utilities for loading data, such as FastLoad, MultiLoad, or Teradata Parallel Transporter (TPT). Choose the one that best fits your data volume and structure.   

2. Prepare Load Scripts: Write the control file or scripts required by the chosen utility, specifying source data file location, data format, error handling, and target table.

   Example for FastLoad:

   ```sql

   LOGON your_teradata_server/your_username,your_password;

   BEGIN LOADING YourDatabase.YourTable

   ERRORFILES YourDatabase.Err1, YourDatabase.Err2;   

   DEFINE

   Column1 (CHAR(100)),

   Column2 (CHAR(100)),

   -- Define all columns as per the source file format

   FILE = your_data_file;

   INSERT INTO YourDatabase.YourTable

   VALUES

   (

   :Column1,

   :Column2,

   -- Map all columns

   );

   END LOADING;

   LOGOFF;

   ```

3. Execute Load Script: Run the load script using the Teradata utility command-line interface.

1. Check Load Summary: Review the logs and output of the load utility to ensure that the load process completed successfully without errors.

2. Sample Data Queries: Run some queries against the loaded data in Teradata to verify that the data looks correct.

3. Data Quality Checks: Perform any necessary data quality checks to ensure the integrity of the data.

1. Archive or Delete Flat File: Once the data is successfully loaded into Teradata, archive or securely delete the flat file if it's no longer needed.

2. Optimize Teradata Tables: Collect statistics on the new tables to optimize query performance.

3. Document the Process: Keep a record of the steps taken and any scripts used for future reference or recurring data transfers.

‍Additional Notes

- While this process does not use third-party connectors, it does require the use of native utilities provided by SQL Server and Teradata.

- Always test the process with a small subset of data before attempting a full-scale data migration.

- Consider data types and character sets compatibility between SQL Server and Teradata to avoid data corruption or loss.

- Make sure to comply with any data governance or compliance requirements during the data transfer process.