Hi William Hampton,
This thread is a month old, sorry for the delay in coming back to you.
Is your query solved or do you still require assistance?
Our community could help you regarding this question.
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Assuming that zip-code, region and division is in your data set or view from the database.
In Tableau 10, simply right click on division or region and select Geographic Role > Create From > Zip Code. This will allow you to have a filled map as well.
Let us know if you have any other questions.
I am also having the same problem. Is this something that the community has resolved? Unfortunately, Shawn's response above helps create the custom geographies, but doesn't remove the primary data source. Anyone else resolve this? I have the same question posted here: Loading Custom Geographies to Remove Custom Map Primary Data Source