Modeling Existing Structure

[Fruit Bat]

Hi All,

I am new to Revit and this forum. I am using Revit Structure 2014 as I work for a structural engineering consultancy.

I have a project where there is an existing steel framed building that is to be refurbished. This includes raising a floor level, creating service shafts, infilling floor voids and adding another storey on top.

I was wondering the best way to differentiate between the existing steelwork structure and the new steelwork? I might still be thinking as if i'm using CAD where I would create separate layers with different colours so I can easily see the difference and turn off and on when required. Is there a way to create an 'Existing Structural Column' layer for example?

The same applies to walls, floors, roofs etc... where I have existing and new.