Dependind if you have RDL or RDLC file (RDL files are created by the SQL
Server version of Report Designer; RDLC files are created by the Visual
Studio version of Report Designer) you can open it in the appropriate
tool and make modifications. See the following article if you have to
convert from one format to the other:
http://msdn.microsoft.com/en-us/library/ms252109.aspx
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Plamen Ratchev
http://www.SQLStudio.com