As far as I'm aware of that is not possible using the opscenter. I recommend you use the cassandra-cli and perform an update column family query.
2012/3/29 puneet loya <puneetl...@gmail.com> > I m currently using the the datastax opscenter. > > How do we add column to the column families in opscenter?? > > > -- With kind regards, Robin Verlangen www.robinverlangen.nl