Oh blimey… trying the grouping thing left me with a single object rather than two…
Maybe I’m going about this the wrong way. In my design, there is a plate inclined at 15 degrees at the back of the desk. This will be supported by bars running under the desk. I’ve drawn the plate and I’ve drawn the bars. I need to bring the bar against the plate to become a single part (the real thing would be welded). I’m using layers so that I can see the whole design or just the bracing.
Thanks for all your answers!