When "WorldWide" is selected,Filters B will only show item "WorldWide".
When "Region" is selected,Filters B will only show Countries belong to that region.
When "By Country" is selected,Filters B will show all the countries except "WorldWide"
Enclosed workbook is currently what I have done.I use parameter and one calculate field to make that function.
It work well in low record count.But in my case,unfortunately，we have too many records in which case using this method will bring performance issue.I think that is because complex condition calculation.
I need some advice about tuning the performance or give another solution for dealing with this kind of requirement.