To Add Filters to Object Snaps

1. At the Command prompt, enter AMOPTIONS.
2. In the Options dialog box, select the AM:Preferences tab.
3. In the AM:Preferences tab, select Snap Defaults.
4. In the Snap Settings dialog box, choose Filters.
5. In the Entity Filter dialog box, choose New.
6. In the New Entity Filter dialog box, make the necessary entries and choose OK.
7. Click OK in all dialog boxes.