@mitcorb said:

Are you maybe talking about Section Cut Faces? TIG

Yes, but I wanted sliced part of the group was deleted automatically for the plugin .

Very nice, but I was thinking in a free Pugin

I need to make a plan isometric of the ground floor of a building .. I modeled the building, now I wonder if there is a plugin that makes the cutting of walls, windows, doors, components, all at once, and then export the file to cut another program and so do the rendering. As this image link: http://dl.dropbox.com/u/1531688/Isom% C3% A9tricas.jpg