I think you can add more columns to the existing security table and when you filter it, you can create a calculated field of 8 different scenarios (access to all three, or 2 out of 3, or 1 each or none) and use that as a filter.
Hope this helped. Thanks,
Hi Mia. I too have the same need as Stephen (be able to secure data on 2 or 3 columns in the underlying security table)...could you please elaborate a bit on your solutions/response?