Dynamic Selection of Visualization Fields

I have some location data (GPS coordinates) where each row has multiple locations, for instance Start Location and End Location.  I have a map where I plot the locations, but only 1 location per map can go in the latitude field. What I would like to be able to do is have a slicer where a user can select "Start" or "End", and have the map change the points based on the user selection. changing the columns that the map visualization is pulling from based on user selection.  

Not sure if this is possible, but any help would be greatly appreciated.