I usually create and save the Camera and lights as their own files (Save Camera Preset and Save Light Preset, respectively) then merge them in to the scene(s) when everything else is set up and render through that camera only (I usually name it ShotCam to remind me that it’s the camera I want to use)
Fair warning, I’m using DS Pro 4.0.3.47, so things may be slightly different if you’re using DS 4.5 with the DUF format, though I imagine that there should still be options to save just the cameras and lights.