You can select individual body parts, go to the properties panel (CTRL-I), and turn off the Visible option. Other than that, there's no way to make something completely transparent. There is no way to add texture effects to the cartoon modes from within Poser itself; it draws stuff based on geometry alone. Any additional detail must either be modelled (a daunting task), or added in postwork. If you have a nonlinear video editor like Adobe Premiere, you could render the animations twice (once in cartoon mode, and once with textures), then blend the two videos together to get textured models with cartoon lines.