If you're just doing it for yourself then just use the P6 material room, if you want to make it available to others then what SamTherapy said is the easiest way to do it. I'm not a professional, but Mapps told me to do it that way for a character I'm making for freestuff and it worked properly and was very easily done!

Injustice will be avenged.
Cofiwch Dryweryn.