Modify Existing Crystal Report

Please help me. I want to add field into exsting Crystal Report. once i add new field i want to filter using that field. I now how to filter but dont know how to add new field to existing crystal repo开发者_运维问答rt.

Thanks in advance

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I'm not sure what tools you are using. Using the Crystal Reports IDE, I just drag a field from the data source to the report surface to add it.