Yeah, sorry for my poorly written question.

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So, you have a prop that you do not want to see shadows on? This has nothing to do with the "Poser Ground" plane, right?

Exactly, its a scene with 2 characters and some props inside a small room. They are cartoon characters from Daz3D, no shaders or advanced materials, just basic textures.  I'm using AO and Raytraced shadows just to bring more detail to the models and its only one light casting it, but like I said, it casts to the floor too and I dont want that for the particular effect I'm trying to get. I want it to react to light, but not shadow.

Thanks for the interest