If the control numbers are not displayed in the model, you can set them visible using the display settings.

1. Double-click the view to open the View Properties dialog box.
2. Click Display... and go to the Advanced tab.
3. Select the Part label check box.
4. In the Properties list, select User-defined attributes, and then click Add >.

   The Part label dialog box is displayed.

5. Enter ACN and click OK.

   The property is moved to the Part label list.

6. Click Modify.

   The control numbers are displayed in the model, right after the part position numbers.