So first of all, thank you Joe Mako for the brilliant video outlining how to create and import custom shape files seen here: http://joemako.tumblr.com/post/3289363623/preprocess-shapefile-for-tableau-tutorial-video
I now have the problem of trying to create a dual axis map, with custom geocoding for Belgian post codes. I'm probably 80% there but I cannot seem to get the blend to work so that I can plot post code points on top of the shape files and then start adding measures.
The idea from the attached would be to make it a dual axis map, and then drop the # Orders on the size shelf. When I do this however all points field the same SUM of orders, it doesn't break down by postal code.
You'll need a field with the same name in each data source to get the blending to work. So if you have "Destination Post Code" in your Primary data source, you'll need to bring in that field with the QGIS output.
Then the magic orange chain link should appear.