Great! That worked. Thanks

I have inserted my SU model into Layout and now I am making construction documents using the model as a "reference" file. I've been trying to draw some 2D lines to indicate some elements that are not in the model. I can't seem to place the line on "top" of the model - in some areas it becomes hidden by surfaces. Is there any way to "lock" the height of the Layout drawings to be below anything that is live in Layout? Tried to arrange the model to the "back" and my lines to the "front" but that didn't work. What's the solution to this issue?

Also, when placing arcs in Layout, it creates a closed surface area that blocks the imported model. Is there any way to make that surface "hidden" or "transparent" so that I can see what's under the closed area of the arc?

Any help appreciated!
Thanks.