I have some attributes that I am using to build hierarchies....(go figure).....after these attributes have been included in the hierarchy due to the change that I have made in their key columns they are no longer of use to an end user. If that doesn't make sense you probably don't know the answer to this question. (basically it splices the data by key columns included)
Go to dimension tab, right click on your attribute. Set the attributehierarchyvisible to false. This will stop your attribute from being visible to your enduser and it will not be seen in the cubebrowser either.