You can assign proprieties to different layers, to selectively view, print, color and lock different categories of shapes, as well as control whether you can snap to or glue to shapes on a layer.
To assign layer properties:
Click the Handset Designer tab, then click the Layers Tabke button in the CAD tools group
To enable/disable options, click the appropriate checkboxes. The options include:
Visible
When enabled, items assigned to this layer will be visible on the drawing page. When disabled, items will be hidden from the drawing page but may still be included in calculations, selections and other actions.
Print
When disabled, items assigned to this layer will not be included in printed copies of the drawing.
Active
Automatically assigns shapes to active layers when the shapes are added to the diagram.
Lock
When enabled, items assigned to this layer will be locked in their current state. Locked items cannot be moved, selected or edited.
Snap
Turns the snap function on or off for that layer.
Glue
Turns the glue function on or off for that layer.
Color
Shows or hides the layer color.
Remove Unreferenced Layers
When selected, layers that have no assigned items will be removed from the list, leaving just the layers in use.
Click OK