Here is a document that we use in training. It has a variable call "MyRegion" that you can set the value to the RegionName.
You would do that here.
This will cause it to create one document for each value. However, if you are not careful you will end up with only one document. You have to make sure you name the documents different some how. Below is an example of that.
Notice that I am using the document name and then adding the region to the end.