Going back to the discussion in 2011, I found this solution that might help. I havnt tried it yet myself.
"Laszlo's suggestion re: composites and yours re: additional renovation statuses (it would be nice to be able to set custom statuses) are the the long term solutions, and would be very useful developments. However, here is a workaround in the meantime:
Highlight your existing wall in the existing filter view and press the toggle button to the right of the "new status" button. (This toggle button is called "show on current renovation filter only/show on all renovation filters"). This will stop the wall showing up in the proposed (or any other) filter views.
Now copy the existing wall to the clipboard, switch to the demolition plan filter and paste the wall in from the clipboard, and repeat this process for each filter you wish the wall to appear on as existing.
This toggle button is quite useful - it is possible to present several different proposal options or show all the different phases of a project in the one model file using this in conjunction with the custom filter views.