Report filters are leveraging the report variables.
When Filter variable is set up to drill-down path, all Views including this Drill-down will be filtered according the definition.
In such dynamic defintion, the Views including the filtered Drill-down will be refreshed after every modification done to variable in right Variables panel.
For more information about Setting Filters on views - continue by Using Filters.
Filter and variable names
When creating a filter or variable you are able to give it a name or a code. Just click on the settings sign and give a name to your variable or filter.