How to insert a plane in Keyshot?

In KeyShot 4, you can select 'Edit, Add Ground Plane'. Alternatively, you can import a plane as geometry. So, say you create a plane in SolidWorks and save it. You can import that plane directly into KeyShot as geometry, then apply your materials/textures to it.

Thanks, How about on Keyshot 3. Is it possible?

You can also add any photo to your background and match the model position and lighting to it. This is how I do all my models.