Welcome to the forum. For future reference and to help others, setting a descriptive title in your thread aids with searches.

Using Windows Explorer, locate the location of the gallery on your system.

For me on Windows 7, the 'Images' folder is here.

C:\ProgramData\Philips\ProntoEdit Professional 2\Gallery\Images

From there, you will find folders which are categories that you can see in PEP. You can create your own categories folder and then add your images to that folder.

Note that you may need to restart PEP2/3 once you do this.

Lyndel