Here is what I did to do what you are wanting to do.
I first created all the conveyors with the DPs, connections and what not. Then I added a Plane object (under Visual in the Library) and resized to so that it was a small square. Then I placed that Plane above the top conveyor and just to the left of the long vertical conveyor and colored it blue so that it is clearly visible. Then I selected all of the conveyors (and Plane) using the shift-left mouse to "rope" all of the objects. Then I deselect the Plane (Crtl-Left Mouse click) which makes it highlighted (yellow box around it). Then I opened the Edit Selected Objects by going to the menu option View>Edit Selected Objects. I should show up as a tab next to the Quick Properties window on the right of the screen. Then, with all the conveyors, DPs, etc. selected (red box) and the Plane highlighted (yellow box) I clicked the Move into Highlighted button at the top of the Edit Selected Objects tab.
What this does is place all the conveyors into the Plane. Then to copy all of the conveyors in that Plane, I just select all of the objects, including the plane (red box) and press the Ctrl-C key. Then I place the cursor in the model where I want to copy the conveyors to and press Ctrl-V. The new conveyor set will appear. Just deselect all of the objects (Shift-Left mouse click in open model space) and all the copied conveyors should look like the original set.
Attached is a model that has the original set of conveyors with the Plane. Try coping those as described above and see if it will work for you the way you want it to.
Here is the model: copyingconveyors-fs1.fsm