You can use the Make
               Live (  ) option
            with snapping to create or move geometry that is locked to existing
            geometry.
 ) option
            with snapping to create or move geometry that is locked to existing
            geometry.
         
Snap all creation tools to a surface or construction plane
You can set a surface so that all creation tools (such as the curve drawing tools) are locked on to the surface. This does not affect actions (such as the create primitives commands).
To snap creation tools to the selected surface
 in the Status
                     Line (toolbar), or select 
                           Modify > Make Live.
  in the Status
                     Line (toolbar), or select 
                           Modify > Make Live.
               While the Make live icon is on, creation tools snap to the surface when in Interactive Creation mode. Click the icon again to stop snapping to the surface.
To snap creation tools to a plane
 , set
                  the initial orientation of the plane and click Create.
 , set
                  the initial orientation of the plane and click Create.
               While the Make live icon is on, creation tools snap to the surface when in Interactive Creation mode. Click the icon again to stop snapping to the surface.
Snap translation to live object
You can set a surface so that a translated surface locks onto it.
 in the Status
                     Line (toolbar), or select 
                           Modify > Make Live.
  in the Status
                     Line (toolbar), or select 
                           Modify > Make Live.
                  If you perform a free translate on the object, it snaps to the live surface.