Using object snap ensures that you select precise locations on objects. And object snap tracking enables you to select a point located a precise distance away from an object. You can actually use object snap tracking to track in two directions by tracking from both the base point and the second point. For example, perhaps you want to move the desk toward the corner of the room, but actually want it to be located 12 units down from the corner and 3 units away from the face of the wall.
On the Home ribbon, in the Modify panel, click the Move tool. The program prompts you to select objects, and you can use any convenient object selection method. In this case, use a selection window. Once all of the objects are selected, right-click.
When the program prompts you to specify the base point, move the cursor over the endpoint of the corner of the desk, but do not click. To acquire that corner for object snap tracking, you simply move the cursor over the corner until you see the object snap glyph and tooltip. Then, when you move the cursor away, you can see the tracking alignment.
It really does not matter which distance you specify first. You could track up 12 units and then track away from the wall 3 units, or you could track toward the wall 3 units and then track down from the corner. Either method will yield the same results.
In this case, move the cursor up along the 90-degree tracking alignment, type the desired distance of 12 units, and press ENTER. The cursor is now positioned at the base point, which is exactly 12 units away from the corner of the desk.
Now, when the program prompts you to specify the second point, move the cursor toward the corner until you see the endpoint object snap glyph and tooltip, track along the 0-degree alignment, type “3 “, and press ENTER. As soon as you do, the command ends and the desk has been moved so that it is precisely 12 units down from the corner and 3 units away from the face of the wall.
Source: Autodesk
