The Assemblies category of Revit elements supports construction workflows by letting you identify, classify, quantify, and document unique element combinations in the model.
You can combine any number of model elements to create an assembly, which can then be edited, tagged, scheduled, and filtered.
Each unique assembly is listed as a type in the Project Browser, from where instances of that type can be placed in the drawing either by dragging or by using the Create Instance option on the context menu.
You can select an assembly type in the Project Browser or an instance of that type in the drawing area and generate one or more types of isolated views of the assembly as well as parts lists, material takeoffs, and sheets. Assembly views are listed in the Project Browser, from where they can be easily dragged onto project or assembly sheet views as needed.
Which elements can be included in assemblies?
Most model elements (walls, floors, roofs, family instances, parts, and so on) can be included in assemblies. The following elements cannot be included:
Annotations and detail items
Assemblies and elements that are already part of another assembly
Complex structures (trusses, beam systems, curtain systems, curtain walls, stacked walls)
Elements in different design options
Groups
Imports
Images
Links or elements in a link
Masses
MEP-specific elements (ducts, pipes, conduits, cable trays and fittings, HVAC zones)
Model lines
Railings that have a continuous top rail or handrail defined in the railing type properties
Reinforcement Fabric Sheets
Rooms
Stairs created by components (stairs created by sketch can be included)
Structural loads, load cases, and internal loads