Sorry for the delay in getting a response. Do you still need assistance with this? Can you post an example?
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One option is to automate the creation of your ad-hoc groups by temporarily leveraging data blending. The following article describes how: http://kb.tableausoftware.com/articles/knowledgebase/how-create-primary-groups-secondary-source
This technique works for importing aliases as well.
I hope this helps,