Here is something which might help those using old versions of Poser, where the interface does not support creating new cameras. "6Cams.cr2" contains 6 extra AUX cameras. The new cameras are named AUX_A through AUX_F. You can set them up how you like then re-save the cr2. As Silke noted, you should not use the "Perspective" dial, as its value does not get saved. To select the view through one of the new cameras, right click in the Document Window and select the Camera View. Then to select the camera itself, and bring up its palette, you can double click on the trackball icon.

In order to attach the zip to this post, I had to add a ".TXT" extension to the file name, you will need to loose the ".TXT" part of the file extension before you can extract the zip. You may need to change your Windows Folder Options in order to see file extensions.