Once you pointed it out, I was able to find that category! I did not realize earlier that it existed already. I guess it just never occurred to me to look under World War II.
I had laready set up the new Holocaust category and followed the advice from the categorization project (See Philip Smith's help above) to put it as a subcategory of World History. I started to create individual camps as subcategories of Holocaust. I notice that you also added yours to this Holocaust category.
I'm waiting on doing any more to the category structure, hoping that the categorization project will make those decisions, but I suggested using wikipedia's structure - starting immediately under World History, have a category for Genocides. In that there would be 4 holocausts, including this one, Although I'm adding the camps right now under Holocaust (and plan to include descriptions and/or links to wikipedia and/or other web pages about each camp on its category page - thanks for the head start you're giving me on getting that info), I think there should be another level - under Holocaust, there should be ghettos and camps. The camps I'm entering as I find them would go under the camps subcategory.
By the way, if you look at any of the ones I did that are in the Holocaust category, you'll see a link to a document that has all the data for all the members of the family we're both working on. It is a transcription of pages of testimony accumulated by commissions/tribunals/whatever that looked into the Nazi atrocities.
I must tell you that, since "adopting" all the orphan profiles in this gedcom and getting so involved in working on them, I feel very vested in what I'm doing - to the point that I now think of them as MY family. I can't help but speculate on the possibility that they might, in reality, turn out to be my family when I manage to find out more information about my mother's side, which was Hungarian. I don't know exactly where, though, so it might turn out to be Germany, Austria, or Roumania. I do know that many family members who had not come to the US before World War II ended up dying in the Holocaust.