I'm building a 3 floor building in sh3d and in the middle of the rooms I want to cut out a part of the floor so that you can look from the top floor all way down to the groundfloor.

Is there an easy way to do this as I only found a PDF but this I did not understood. http://www.sweethome3d.com/SVGPathMiniManualForSweetHome3D.pdf

I hope that there is somebody out there who can help me.

thanks on forehand

Hans