How are you drawing it? Seperate lines or using an autoshape like the Pie autoshape?
I've never been able to do that in Fireworks in 11 years with ordinary paths but yes there are a few tools which can help you - The Perspective, The 3D Box and Pinwheel Auto Shape are a few. They can be found in the Shapes panel (Windows >> Auto Shapes). The Perspective auto shape in particular will give you what you are looking for. Tip: Click the vanishing point handle to toggle the different views of the autoshape.
Hope this helps.