Is it possible to upload my own custom word list for WiFi Cracking on the Portable Penetrator?

Yes.

You can generate custom word lists for cracking WPA WiFi Handshakes on the Portable Penetrator.

You can also upload your own word lists files easily.

The word list files need to be placed in /home/apps/wordlist/languages/ for the Portable Penetrator interface to be able to utilize it.