The short answer is yes. You can use the Crystal SDK to create a Crystal Document object and from their access to fields and data connection parameters. Keep in mind that changing the fields directly in the report is risky , as this means that updating the report can damage your code. You might be better off presenting your changed data as a result of a stored procedure or view, and then point to a report.
SAP Srytal Sdk Samples provide great examples of report changes.
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