@Hari_Seldon
Along with what @Jethro said about the INPUT and TEXT lines,

I can simply it even more. For the Command Prep Area, just add this simple line:

 ;---Command Prep. Checks command to see which data file it will be pulling from depending on command entered ---
set %wu_command $replace(%wu_command,$chr(64),$chr(33))

This simply replaces the @ ($chr(64)) with the ! ($chr(33)) in %wu_command.