To Place Drawing Items on Layers
Placing drawing items on layers enables you to control the display of multiple items simultaneously. Layers are a good way to organize items and can streamline selection since all the layer items are treated as a group.
You can place drawing items on layers manually or automatically.
To Manually Place Drawing Items on Layers
1. On the Model Tree, click > . Any existing layers are listed.
2. Define the layer to place the drawing items on:
◦ To create a new layer, click > . The Layer Properties dialog box opens.
◦ To place the items on an existing layer, right-click the layer and click Layer Properties. The Layer Properties dialog box opens.
3. Click Include and select the desired items from the graphics window or Model Tree. Use the drawing filter to limit the items available for selection. A 
appears next to the included items.
appears next to the included items.4. Click OK.
To Automatically Place Drawing Items on Layers
Create a default layer by setting the def_layer configuration option. You can more easily control on which layer the items are placed by setting the layer as active.
You can place the following drawing items on an active layer:
• Draft entities including draft datums, groups, and axes
• Notes and parametric notes
• Geometric tolerances and their datums
• Dimensions (model, drawing, reference)
• Datum targets
• Symbols and Surface finish symbols
• Tables
• Snap lines
You can also add the following three-dimensional detail items:
• Notes
• Driven dimensions
• Reference dimensions
• Geometric tolerances
• Symbols and Surface finish symbols