Does anyone have a good way of incorporating red-lines into a revit model to create an as-built model. I am looking for a way to keep the "Issued for Construction" model, while having the as-built condition as well. The customer wants one file showing what we built from (IFC) and what was actually built. I was thinking of doing the as built as another phase, but since that's not what it was meant for I'm sure there are many downsides to that. Does anyone have a similar experience? Any best practices?