I have some attributes that I use to create a hierarchy .... (go figure) ..... after these attributes were included in the hierarchy due to the change I made in my key columns, they are larger not used for end user. If that doesn't make sense, you probably don't know the answer to this question. (basically it combines data on key columns)
Go to the dimensions tab, right-click your attribute. Set the Hierarchy attribute to false. This will stop your attribute from being visible to your end user, and it will also not appear in the cubir.