Layers are useful for organizing the different elements in your part document.
Layers are useful for controlling the view. If your layers are well organized, you can turn the display of different layers on and off.
System layer — You cannot edit a System layer, but you can show or hide it.
User layer — Add your own layers to organize your work.
Current layer — New items are added to the current layer. You cannot hide the current layer.
Use the Layers dialog to manage layers.
Right-click Layers in the Part View and select Layers.
In the Layers dialog, click New, enter a name for the new layer, and click OK.
When you create a new element, it is created on the current layer.
To set the current layer, select a layer in the Current Layer list in the Layers dialog.