To Add Items to a Layer
1. In the Layer Tree, right-click the layer to which you want to add items.
2. Click Layer Properties on the shortcut menu. The Layer Properties dialog box opens.
3. Select the required items to place on the selected layer. Select items in the graphics window, Model Tree, or use the search tool.
If you are in Assembly mode and you select an item to add to a layer and the item does not belong in the top level model, then the Place External Item dialog box opens. Use this dialog box to add such items to a layer.
You can add datum axes and coordinate systems to layers as entities either through the Creo Parametric graphics window or by using the search tool. Selecting a layer highlights the entities on that layer.