That may be a useful set of commands, but where instructions ask for a "windchill shell", they generally intend for one to use the "windchill shell" command to obtain a shell.
If you look at the "Windchill Shell" shortcut generated during installation it will provide all the details:
WT_HOME\bin\windchill.exe -w "WT_HOME" --java="JAVA_HOME\jre\bin\java.exe" shell
where WT_HOME and JAVA_HOME are replaced by the actual path of by %WT_HOME% and %JAVA_HOME% if you set these variables first.