By default the miscellaneous directory points to C:\PTW32\Lib. You can create your own miscellaneous folder and place it inside your project folder to make it project specific.
To do this you can copy the Lib folder in C:\PTW32\Lib and paste it to any location. To save space, you may delete both library files (ptw.lib and changes.lib), the RPTFMT and any default folders from this new directory.
Then you can follow the steps below to set the new directory. Point the Directory field to your new location.