Dynamic Names axis based on selected filter.

Hey Anonymous,
This is possible by creating a table in which the regions are columns and the rows are countries. And then create a field parameter on it. I used the following sample data:

Dim_Countries:

CountryRegionSales

Dim_Region:
Region

Dim_Country_Region (combination table in which you indicate per country to which region it belongs. You could create this table dynamically in M ​​by pivoting the region column in the countries table):

CountryABC

Field paramter (refer to the general region column and call it 'All'. And select all the region columns from the combination table underneath):

Parameter = {
    ("All", NAMEOF('Dim_Region'[Region]), 0),
    ("A", NAMEOF('Dim_Country_Region'[A]), 1),
    ("B", NAMEOF('Dim_Country_Region'[B]), 2),
    ("C", NAMEOF('Dim_Country_Region'[C]), 3)
}

This is how the models looks:

Use the field parameter as a slicer. And also place the field parameter on the x axis of a visual.

'All' selected:

When you select one region: