Hey! RV .. yeah.. sorry I missed that part. One solution I can think about is create a Dervived Table with 1 column (region) having values South, East, West, North, Mid.
Then use this table column for the Input Control. Now create a variable Flag
=ReportFilter([region])
Now Select each table and assign a filter Fo r eg. Select the Texas State table and assign the filter Flag = "South".. Hope this should work.. please test and let us know.