Working with NA data

Create a custom column and try this...

if List.Contains({"NW","SE","NE","SW"},[quadrant]) 
then [quadrant]
else if List.Contains({"NW","SE","NE","SW"},[geo_area_quadrant]) 
then [geo_area_quadrant]
else if Text.Contains([display_address],"NW") then "NW"
else if Text.Contains([display_address],"SW") then "SW"
else if Text.Contains([display_address],"NE") then "NE"
else if Text.Contains([display_address],"SE") then "SE"
else "who knows"

DAX for add new column:

Derived Quadrant = 
SWITCH( TRUE(), 
    'Table'[quadrant] <> "N/A", 'Table'[quadrant],
    'Table'[geo_area_quadrant] <> "N/A", 'Table'[geo_area_quadrant],
    'Table'[quadrant] = "N/A" && 'Table'[geo_area_quadrant] = "N/A" , 
          SWITCH( TRUE(),
              CONTAINSSTRING('Table'[display_address], "SE"), "SE",
              CONTAINSSTRING('Table'[display_address], "NE"), "NE",
              CONTAINSSTRING('Table'[display_address], "NW"), "NW",
              CONTAINSSTRING('Table'[display_address], "SW"), "SW"
              -- ... add more conditions of your needs
          , "N/A")
    , "N/A" -- you can chose if any of the above conditions do not meet, as default value!
    )