Add a new visual and select the funnel chart type.
Drag the Stage calculated field to the Group/Color field well.
Drag the Value calculated field to the Value field well.
This setup will categorize each stage of the funnel based on the conditions you specified and will allow you to visualize all the stages in a single funnel chart using one measure.
If you are loading data from a database, you can efficiently manage this CASE statement and load the transformed data into QuickSight. However, with the available QuickSight functions, it does not evaluate the second condition once the first condition is satisfied because we use the different field names.