Let's create a second identical lightpipe and place it at some Y distance from the first one.

Inset a null object after the detector.

Select objects 1 through 9 by clicking the first object, holding the shift key and pressing the down arrow key.

Select copy object under Edit.

Select object 10 and click paste in the Edit menu.

Enter 20 for Y position parameter of object # 10 (Null object) to place the second lightpipe 20mm way from the first one in +Y direction. Also place a pick solve on the Outer R parameter of Torus Volume #12 to pick up values from the first torus.

The layout now shows 2 lightpipes.

Replicating group of objects is straightforward in this example because we used relative object reference (negative number in the Ref Object column) everywhere. If absolute object referencing was used instead, we would have had to modify the reference object numbers for all objects corresponding to the second lightpipe.