You need to set up additional views (make copies of the views) with phase
filters. Each phase is a range in time. When you draw your inital model,
set all those elements to the existing phase. Now duplicate the view, and
set the phase filter to "Show Previous and demo" then use the demo tool.
It will show the 'existing" items, and the demo items. Wehn done, duplicate
the view again, and set the phase filter to "show previous and new" and se
tthe phase to New construvtion. Now draw in the new stuff, and the view
will show only the exisitng elements, and the new elements.
"Alex S" wrote in message
> I am fairly new at revit and currently I am interested in renovations.
What am I required to do is an existing plan and a plan with the new
> My problem is that I can not switch between phases. Once I use the
demolition command, the walls stay that way and I am not able to view or
print the existing plan.