How do I: Implement $().SPServices.SPCascadeDropdowns
Documentation for $().SPServices.SPCascadeDropdowns
In my opinion, the tricky part to this is the third list “CascadeExample”. It was unclear to me after reading the documentation on the SPServices website that the two columns “Country” & “Region” in the “CascadeExample” list need to be lookup columns. It might be obvious to everyone else.
SharePoint (and Project Server) Shenanigans 
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