Your question assumes you need it in the report. Why do you think it is needed? I am betting it is not needed.
Also, always include your crystal version on all posts, correct answers vary by version.
In any case, the literal answer to your question is to right click the field in question, select format field, common tab, and click the suppress checkbox.
However please post back as to why you believe this field needs to be on the report and we will explore this.
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