Patricia,
Thanks for the Ctrl C Ctrl V, never gave that a thought.
Ok, so I did this, turn on 1st floor, plan view only, box everything showing which is the walls, doors, windows. Do Ctrl C, open new file and paste, you get the walls, windows, doors, electrical and plumbing. Now do a export to .dwg or .dxf and now all you get is walls, windows, doors. Is a lot of work to export, but a work around.
It also appears that if you turn all layers on and export that, that hvac, detail, deck, roof, landscape and plumbing don't export at all.
I also noticed that when you copy and paste everything to a new file that it doesn't take everything, like object items.
I'm done for the night, more work tomorrow
Thanks
Dave