We do not have an example which matches your scenario, however the scenario does not involve any hidden tricks or workarounds, so it should be easily configurable.
My recommendation is to divide the task in two - first get correctly working and populating set of DropDownList. After that focus on cascading them.
There is a how to topic
that demonstrates how to cascade DropDowns generated with ng-repeat.
Your scenario should be much simple.
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