Adding Spot Levels Using Stake Objects. You can use the Stake object to create a site model, instead of a 3D locus, if you set the preferences.
You can set the layer options to Grey/Snap others. This option makes it easy to snap on to information on other layers, but greying the other layers makes it easy to see which spot levels you have placed in the active layer. This option doe not work well with scanned images in the other layer.