First, just remember that role based permission only works when you have Tableau Server. So when you are on Tableau Desktop you only need to create a User Filter in the Server Tab, and then you add it to Filters on your sheet. Its that simple.
Thanks, David. I appreciate the response. I don't yet have Tableau Server (only Tableau Desktop), so I guess I'm not yet able to do what I'd like to do. Good to know. Thanks again for the quick reply.