Use this procedure to attach objects with a system anchor. With system anchors, you can attach building systems objects to other building systems objects based on their assigned system. The movement of an object anchored with a system anchor is constrained by the object to which it is anchored. You can change the position of an anchored object by dragging the object along the entire system run. You can also drag the anchored objects to other runs assigned to the same system.
To attach an object with a system anchor
The object is anchored to the curve at the X position. When the object is placed, the Y and Z positions are 0.