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Is it possible to execute a powershell command and exit back to cmd?

Yes,

start "title" /wait "CMD" /c "echo.&pause"
echo. %return%

start "title" /wait /b "CMD" /c "echo.&pause"
echo. %return%

start "title" /wait "powershell" "params"
echo. %return%

What do you want to do ?

Good work Ed.
A little integrating between cmd and powershell might be fun.