|parent
|    |123
|    |    123abc.png
|    |456
|    |    456def.png
|    |789
|    |    789ghi.png

|parent
|    123abc.png
|    456def.png
|    789ghi.png

FOR /R "C:Source Folder" %i IN (*.png) DO MOVE "%i" "C:Staging Folder"

SetLocal EnableDelayedExpansion
FOR /R "C:Source Folder" %%A IN (*.png) DO (
       Set "CurrFile=%%~A"
       Set "TMPdp=%%~dpA"
       Set "ParFldr=!TMPdp:~0,-1!"
       Echo MOVE "%%~A" "!ParFldr!" ) & REM Delete echo to move. Run to test.