It is true that SAS Web Report Studio does not support column-level security. See
http://support.sas.com/kb/45/094.html
If that is what you were asking, then that cannot be done.
The option for cubes is to exclude (or include) members with only missing values. By default, these members are excluded. In this case, if an entire row or column contains nothing but missing values, then they are suppressed in the crosstab. As far as I am aware, you cannot use this feature as column-level security.
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