Yes as of Tableau 10.0 this custom geo territory feature is available and here is a link to help walk you through the process. https://onlinehelp.tableau.com/current/pro/desktop/en-us/qs_custom_territories.html
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Hi Brian Purcell,
The answer is no. Although you can create custom territories, there is no way to include them as built-in geographic roles using Tableau. This is a feature that we have discussed internally and I would recommend submitting an Idea for it and letting the community vote on it.
Note: If you are creating ad-hoc groups, you are able to copy groups between workbooks (so long as the same underlying data exists in the destination workbook). If you are creating territories, renaming them and expecting to reference the named territories with other business data -- the answer is again, no you can't do that today.
If you are using States or Counties to create your territories, it might take minimal effort to create a shapefile that mimics your territories using an application like QGIS. This is far less intense than trying to wrangle TabGeoHack.
Product Manager, Maps
In case anybody stumbles upon this....
I asked our Tableau support rep about this. He showed me the custom geo coding within the "map" menu. I have a field with the territory name, then a latitude field and longitude field. Then imported it -- it created the centroid markers in custom geography.
Fortunately, I have Alteryx with the spatial data in order to compute the centroid lat & long. Not sure how I would do it otherwise.