To coordinate the design between different levels and different disciplines, plan of one level is put under the plan of another level. This can be done in Revit using Underlay tool. For example, you may want to put Ground Floor level as an underlay while modeling walls on the First floor level to see the alignment and position of the walls on the Ground Floor.
Step by Step Guide: Create an Underlay
Learn how to set an underlay, assign the range levels for underlay and set the view direction of the underlay in this video tutorial – by Autodesk.
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