Layers. You should set up the building so that is has layers for each story of…
cadmovie492 – Plumbing Schematic Part 2
Classes. Layers are ideal for each story of the building. Classes are ideal for the components that go into each story. Layers are where things are, classes are what things are.
A useful strategy is to have classes for the walls (assigned to the walls though the wall styles so that is becomes automatic), classes for fittings and fixtures (assigned to the symbols so it becomes automatic), and classes for all the other parts of your building.
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